WINSTAR COMMUNICATIONS INC
S-4, 2000-07-07
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>

     As filed with the Securities and Exchange Commission on July 7, 2000.
                                                           Registration No. 333-

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   ----------

                             REGISTRATION STATEMENT
                                    UNDER THE
                             SECURITIES ACT OF 1933
                                       ON
                                    FORM S-4

                                   ----------

                          WINSTAR COMMUNICATIONS, INC.
             (Exact Name of Registrant as Specified in Its Charter)

    Delaware                         4813                      13-3585278
(State or Other               (Primary Standard             (I.R.S. Employer
Jurisdiction of                    Industrial             Identification Number)
Incorporation or                 Classification
 Organization)                   Code Number)

                                   ----------

                                685 Third Avenue
                            New York, New York 10017
                                 (212) 792-9800
         (Address, Including Zip Code, and Telephone Number, Including
            Area Code, of Registrant's Principal Executive Offices)

                                   ----------

                                Timothy R. Graham
                  Executive Vice President and General Counsel
                          Winstar Communications, Inc.
                                685 Third Avenue
                            New York, New York 10017
                                 (212) 792-9800
       (Name, Address, Including Zip Code, and Telephone Number, Including
                        Area Code, of Agent For Service)

                                   ----------

                                   Copies to:

                             David Alan Miller, Esq.
                            Graubard Mollen & Miller
                                600 Third Avenue
                            New York, New York 10016
                            Telephone: (212) 818-8800
                               Fax: (212) 818-8881

      Approximate date of commencement of proposed sale to the public: As soon
as practicable after this registration statement becomes effective.

      If any of the securities being registered on this form are to be offered
in connection with the formation of a holding company and there is compliance
with General Instruction G, check the following box: / /

      If this form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering. / /

      If this form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

<PAGE>

(Cover Page Continued)

                         CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
=================================================================================================================================
                                                                       Proposed               Proposed
                                                                       Maximum                Maximum
             Title of Each Class of            Amount to be       Offering Price Per          Aggregate             Amount of
          Securities to be Registered           Registered             Note (1)           Offering Price(2)      Registration Fee
---------------------------------------------------------------------------------------------------------------------------------
<S>                                            <C>                <C>                     <C>                    <C>
12-1/2% senior exchange notes due 2008(3)         325,000             $1,000              $  325,000,000          $   85,800.00
---------------------------------------------------------------------------------------------------------------------------------
12-3/4% senior exchange notes due 2010(4)         637,653             $1,000              $  637,653,000          $  168,340.39
---------------------------------------------------------------------------------------------------------------------------------
14-3/4% senior discount exchange notes due
2010(5)                                           926,957             $1,000              $  926,957,000(6)       $  244,716.65
---------------------------------------------------------------------------------------------------------------------------------
Euro-denominated 12-3/4% senior exchange
notes due 2010(7)                                 190,040             $1,000              $  190,040,000(8)       $   50,170.56
---------------------------------------------------------------------------------------------------------------------------------
12-3/4% senior exchange notes due 2010(9)           1,340             $1,000              $    1,340,000          $      353.76
---------------------------------------------------------------------------------------------------------------------------------
14-3/4% senior discount exchange notes due
2010(9)                                             3,904             $1,000              $    3,904,000          $    1,030.66
---------------------------------------------------------------------------------------------------------------------------------
         Total                                                                            $2,084,894,000          $  550,412.02
=================================================================================================================================
</TABLE>

(1)   Represents the maximum aggregate principal amount of such notes that will
      be exchanged.

(2)   Based on the book value of the notes as of the latest practicable date
      pursuant to Rule 457(f)(2) under the Securities Act of 1933.

(3)   The senior exchange notes due 2008 being registered hereby are being
      offered by us in exchange for our 12-1/2% senior notes due 2008.

(4)   The senior exchange notes due 2010 being registered hereby are being
      offered by us in exchange for our 12-3/4% senior notes due 2010.

(5)   The senior discount exchange notes due 2010 being registered hereby are
      being offered by us in exchange for our 14-3/4% senior discount notes due
      2010.

(6)   Represents the maximum aggregate principal amount of such notes at
      maturity that will be exchanged.

(7)   The Euro-denominated senior exchange notes being registered hereby are
      being offered by us in exchange for our Euro-denominated 12-3/4% senior
      notes due 2010.

(8)   Represents the maximum aggregate principal amount of such notes
      ((euro)200.0 million) converted to United States currency on July 3, 2000
      at an exchange rate of 0.9502.

(9)   A combination of senior exchange notes due 2010 and senior discount
      exchange notes due 2010 are being offered by us in exchange for our
      14-1/4% senior subordinated deferred interest notes due 2007 and/or
      outstanding senior notes due 2010 and senior discount notes due 2010 that
      may be issued prior to the date of this exchange offer in exchange for any
      such senior subordinated deferred interest notes due 2007. The senior
      exchange notes due 2010 and senior discount exchange notes due 2010 are
      identical to the senior exchange notes due 2010 and senior discount
      exchange notes due 2010 referred to in notes (4) and (5) above.

      The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933, as amended, or until the registration statement
shall become effective on such date as the Securities and Exchange Commission,
acting pursuant to said Section 8(a), may determine.

================================================================================

      Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registrations statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of an offer to buy nor shall there be any sale of these securities
in any state in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such state.

<PAGE>

                             PRELIMINARY PROSPECTUS

                   SUBJECT TO COMPLETION, DATED JULY 7, 2000

                          WINSTAR COMMUNICATIONS, INC.

      We hereby offer:

      o     up to $325.0 million aggregate principal amount of our 12-1/2%
            senior exchange notes due 2008 in exchange for up to $325.0 million
            of our outstanding 12-1/2% senior notes due 2008;

      o     up to $637.7 million aggregate principal amount of our 12-3/4%
            senior exchange notes due 2010 in exchange for up to $637.7 million
            of our outstanding 12-3/4% senior notes due 2010;

      o     up to $927.0 million aggregate principal amount at maturity of our
            14-3/4% senior discount exchange notes due 2010 in exchange for up
            to $927.0 million of our outstanding 14-3/4% senior discount notes
            due 2010;

      o     up to (euro)200.0 million aggregate principal amount of our
            euro-denominated 12-3/4% senior exchange notes due 2010 in exchange
            for up to (euro)200.0 million of our outstanding euro-denominated
            12-3/4% senior notes due 2010; and

      o     up to $1.3 million aggregate principal amount of our 12-3/4%
            senior exchange notes due 2010 and up to $3.9 million aggregate
            principal amount of our 14-3/4% senior discount exchange notes due
            2010, in combination, in exchange for up to $2.2 million of our
            outstanding 14-1/4% senior subordinated deferred interest notes due
            2007.

      The outstanding notes listed above are referred to collectively in this
prospectus as the outstanding notes. The notes listed above which we are
offering in the exchange for the outstanding notes are referred to collectively
in this prospectus as the exchange notes.

      Other than the exchange notes issued directly in exchange for our senior
subordinated deferred interest notes due 2007, the terms of the exchange notes
will be identical to the terms of the outstanding notes for which they are
exchanged, except that the exchange notes, including those exchanged for the
senior subordinated deferred interest notes due 2007, will be free of
restrictive legends.

      The exchange offer will expire at 5:00 p.m., New York City time on
_______, 2000 unless extended by us.

                                -----------------

      See "Risk Factors" beginning on Page 14 for a discussion of certain
information that should be considered in connection with the exchange offer and
an investment in the exchange notes.

                                -----------------

      Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

                                -----------------

                 The date of this prospectus is ______ __, 2000

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page

SUMMARY  ......................................................................3
RISK FACTORS..................................................................14
THE EXCHANGE OFFER............................................................16
DESCRIPTION OF NOTES..........................................................27
DESCRIPTION OF CERTAIN OTHER INDEBTEDNESS AND PREFERRED STOCK.................41
CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS.......................55
CERTAIN LUXEMBOURG TAX CONSIDERATIONS FOR EURO EXCHANGE NOTES.................63
LEGAL MATTERS.................................................................64
EXPERTS.......................................................................64
WHERE YOU CAN FIND MORE INFORMATION...........................................64


                                       2
<PAGE>

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                                     SUMMARY

Winstar's business

      We provide our customers with broadband services. We offer a comprehensive
suite of these services across our own end-to-end broadband network in 60 major
markets in the United States, including each of the top 30 U.S. markets. We also
offer services in 12 overseas markets, including Amsterdam, Brussels, Buenos
Aires, London and Tokyo.

      We believe that our rapidly expanding network will enable us to offer
broadband services to a majority of the business market in the United States.
This market is projected to grow from approximately $178.0 billion in 1999 to
approximately $360.0 billion by 2009. Our domestic network combines local and
long-haul capacity with voice and data switching facilities and is capable of
carrying a substantial portion of our customers' communications traffic from
point of origin to point of termination.

Lucent facility

      In May 2000, our subsidiary, WVF-I LLC, entered into a new credit facility
with Lucent Technologies Inc. in an aggregate amount of $2.0 billion. This
facility replaced our then existing facility with Lucent. We and WCI Capital
Corp., our subsidiary and the borrower under the Bank facility described below,
are guarantors of this facility. Up to $1.0 billion of our new Lucent facility
is available to us at any one time for the purchase of network equipment and
related services. The balance will become available as the first $1.0 billion is
refinanced or syndicated. Lucent and its transferees are entitled under certain
circumstances to convert loans outstanding under the Lucent facility into the
notes identical, other than as to interest rates, to the senior notes due 2010.

Bank facility

      In May 2000, WCI Capital Corp. entered into a $1.15 billion revolving
credit and term loan agreement with a group of commercial banks and other
financial institutions. We and certain of our other subsidiaries are guarantors
under that agreement. We have fully drawn down all available loans under the
Bank facility and used those proceeds to pay all of the outstanding loans under
our former facility with Lucent.

Issuance of outstanding notes

      We issued substantially all of our currently outstanding notes in April
and June 2000 as part of a plan of refinancing. The refinancing was comprised of
the new Lucent facility and the Bank facility discussed above and the additional
transactions discussed below. We undertook the refinancing in order to simplify
our financial structure, provide us with additional capital and increase our
operational and financial flexibility.

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                                       3
<PAGE>

--------------------------------------------------------------------------------

      Exchange offer

      We issued approximately $362.2 million principal amount of our 12-3/4%
senior notes due 2010 and approximately $613.9 million principal amount at
maturity ($300.8 million initial principal amount) of our 14-3/4% senior
discount notes due 2010 in exchange for:

      o     100.0% of our outstanding 15% senior subordinated deferred interest
            notes due 2007;

      o     96.4% of our outstanding 10% senior subordinated notes due 2008; and

      o     99.9% of our outstanding 11% senior subordinated deferred interest
            notes due 2008.

      Cash tender offer

      We purchased for an aggregate of $753.3 million in cash:

      o     96.4% of our outstanding 14% senior discount notes due 2005;

      o     100.0% of our outstanding 14-1/2% senior deferred interest notes due
            2005;

      o     99.8% of the outstanding 12-1/2% guaranteed senior secured notes due
            2004 of our subsidiary, Winstar Equipment Corp.; and

      o     100.0% of the outstanding 12-1/2% guaranteed senior secured notes
            due 2004 of our subsidiary, Winstar Equipment II Corp.

      Private placement

      We also completed a cash offering of $325.0 million aggregate principal
amount of our 12-1/2% senior notes due 2008, an additional $168.3 million of our
12-3/4% senior notes due 2010 and (euro)200 million aggregate principal amount
of our euro-denominated 12-3/4% senior notes due 2010. The proceeds of this
offering, together with additional cash drawn from available funds, were used to
partially fund the cash tender offer.

      Series C preferred stock exchange

      As part of the refinancing, we entered into agreements with the holders of
98.7% of our then outstanding Series C preferred stock to provide for the
conversion of that stock into our 14-1/4% senior subordinated deferred interest
notes due 2007 and then for the exchange by those holders of such notes for
senior notes due 2010 and senior discount notes due 2010. As a result of these
transactions, no shares of Series C preferred stock remain outstanding, $172.8
million principal amount of the 14-1/4% senior subordinated deferred interest
notes due 2007 was exchanged for $107.2 million principal amount of senior notes
due 2010 and $313.0 million

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                                       4
<PAGE>

--------------------------------------------------------------------------------

principal amount at maturity of senior discount notes due 2010 and $2.2 million
principal amount of the 14-1/4% senior subordinated deferred interest notes due
2007 remain outstanding.

Corporate Information

      We were incorporated under the laws of the State of Delaware in September
1990. Our principal executive offices are located at 685 Third Avenue, New York,
New York 10017 and our telephone number is (212) 792-9800.

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                                       5
<PAGE>

--------------------------------------------------------------------------------

                          Summary of the Exchange Offer

Terms of the exchange offer

The exchange offer............   In the exchange offer, we will issue:

                        o     up to $325.0 million aggregate principal amount of
                              our senior exchange notes due 2008 in exchange for
                              up to $325.0 million aggregate principal amount of
                              our outstanding senior notes due 2008;

                        o     up to $637.7 million aggregate principal amount of
                              our senior exchange notes due 2010 in exchange for
                              up to $637.7 million aggregate principal amount of
                              our outstanding senior notes due 2010;

                        o     up to $927.0 million aggregate principal amount at
                              maturity of our senior discount exchange notes due
                              2010 in exchange for up to $927.0 million
                              aggregate principal amount at maturity of our
                              outstanding senior discount notes due 2010;

                        o     up to (euro)200.0 million aggregate principal
                              amount of our euro exchange notes in exchange for
                              up to (euro)200.0 million aggregate principal
                              amount of our outstanding euro notes;

                        o     up to $1.3 million aggregate principal amount of
                              our senior exchange notes due 2010 and up to $3.9
                              million aggregate principal amount of our senior
                              discount exchange notes due 2010, in combination,
                              in exchange for up to $2.2 million of our
                              outstanding senior subordinated deferred interest
                              notes due 2007;

Resale................  Based on an interpretation by the staff of the SEC set
                        forth in no-action letters issued to third parties, we
                        believe that, after issuance, the exchange notes may be
                        offered for resale, resold and otherwise transferred by

--------------------------------------------------------------------------------


                                       6
<PAGE>

--------------------------------------------------------------------------------

                        you (unless you are a broker-dealer as discussed below)
                        without compliance with the registration and prospectus
                        delivery provisions of the Securities Act. The
                        outstanding notes, however, must have been acquired by
                        you in the ordinary course of your business and you must
                        have no arrangement or understanding with any person to
                        participate in the distribution of the exchange notes.

                        Each broker-dealer that receives exchange notes issued
                        in this exchange offer for its own account in exchange
                        for the outstanding notes that were acquired as a result
                        of market-making or other trading activity must follow
                        the procedures set forth in the section of this
                        prospectus called "The Exchange Offer -- Purpose and
                        Effect of the Exchange Offer."

                        The exchange offer is not being made to, nor will
                        tenders be accepted from, holders of outstanding notes
                        in any jurisdiction in which this exchange offer would
                        not be in compliance with the securities laws of such
                        jurisdiction.

Expiration date.......  5:00 p.m., New York City time, _____ __, 2000, unless
                        the exchange offer is extended. Any extension, if made,
                        will be publicly announced through a release to the Dow
                        Jones News Service and as otherwise required by
                        applicable law or regulations. We may extend the
                        expiration date in our sole and absolute discretion.

Conditions to the
 exchange offer.......  The only conditions to the exchange offer are that it
                        not violate applicable law, any applicable
                        interpretation of the staff of the SEC or any standing
                        order or judgment. The exchange offer is not conditioned
                        upon any minimum principal amount of outstanding notes
                        being tendered.

Procedures for
 tendering outstanding
 notes................  If you wish to accept the exchange offer, you must
                        complete, sign and date the letter of transmittal, or a
                        facsimile copy, in accordance with the instructions
                        contained in this prospectus and the letter of
                        transmittal, and mail or otherwise deliver the letter of

--------------------------------------------------------------------------------


                                       7
<PAGE>
--------------------------------------------------------------------------------
                        transmittal together with the outstanding notes to be
                        exchanged and any other required documentation to United
                        States Trust Company of New York, as exchange agent.

Special procedures for
 beneficial owners....  If you are a beneficial owner whose outstanding notes
                        are registered in the name of a broker, commercial bank,
                        trust company or other nominee, and you wish to tender
                        in the exchange offer, you should contact your
                        registered holder promptly and instruct the registered
                        holder to tender on your behalf. If you wish to tender
                        on your own behalf, you must, prior to completing and
                        executing the letter of transmittal and delivering your
                        outstanding notes, either make appropriate arrangements
                        to register ownership of the outstanding notes in your
                        name or obtain a properly completed bond power from the
                        registered holder. You should be aware that the transfer
                        of registered ownership may take considerable time and
                        may not be able to be completed prior to the expiration
                        date.

Guaranteed delivery
 procedures...........  If you wish to tender your notes and your outstanding
                        notes are not immediately available or you cannot
                        otherwise deliver your outstanding notes and the
                        required documentation to the exchange agent prior to
                        the expiration date, you may tender your outstanding
                        notes according to certain delivery procedures. In such
                        situations, you must deliver to the exchange agent a
                        letter stating that a tender is being made and
                        guaranteeing that all the required documentation will be
                        delivered to the exchange agent within three New York
                        Stock exchange trading days.

Acceptance of
 outstanding notes
 and delivery of
 exchange notes.......  Subject to certain qualifications, we will accept for
                        exchange any and all outstanding notes which are
                        properly tendered in this exchange offer and not
                        withdrawn, prior to 5:00 p.m., New York City time, on
                        the expiration date.

Withdrawal rights.....  Subject to the conditions set forth in this prospectus,
                        you may withdraw your tender of outstanding notes at any
                        time prior to 5:00 p.m., New York City time on the
                        expiration date.

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                                       8
<PAGE>

--------------------------------------------------------------------------------

Certain federal
 income tax
 considerations.......  The exchange of outstanding notes for exchange notes in
                        this exchange offer does not constitute a taxable
                        exchange for federal income tax purposes. Each exchange
                        note will be treated as having been originally issued as
                        of the date the outstanding note being exchanged was
                        originally issued. However, you should consult your own
                        tax advisor.

Exchange agent........  United States Trust Company of New York, the trustee
                        under the applicable indentures, is serving as exchange
                        agent in connection with the exchange offer. For
                        information with respect to the exchange offer, the
                        exchange agent's telephone number is (212) 852-1000 and
                        its facsimile number is (212) 852-1625.

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                                       9
<PAGE>

--------------------------------------------------------------------------------

                               The Exchange Notes

      Other than the exchange notes issued directly in exchange for our senior
subordinated deferred interest notes due 2007, the form and terms of each series
of exchange notes will be the same as the form and terms of the series of
outstanding notes for which they are exchanged, except that the exchange notes
(including those exchanged for senior subordinated deferred interest notes due
2007) will be registered under the Securities Act and, therefore, will not bear
legends restricting their transfer. The exchange notes will evidence the same
debt as the outstanding notes for which they are exchanged and the exchange
notes will be entitled to the benefits of the applicable indentures. Upon
consummation of the exchange offer, any outstanding notes that have not been
exchanged for exchange notes will not be entitled to further registration rights
under the registration rights agreements which apply to certain of the
outstanding notes.

Maturity dates:

       Senior exchange notes due 2008.......  April 15, 2008

       Senior exchange notes due 2010
         and euro exchange notes............  April 15, 2010

       Senior discount exchange notes due
         2010...............................  April 15, 2010

Interest payment dates:

       Senior exchange notes due 2008.......  April 15 and October 15,
                                              commencing October 15, 2000

       Senior exchange notes due 2010
         and euro exchange notes............  April 15 and October 15,
                                              commencing October 15, 2000

       Senior discount exchange notes due
         2010...............................  April 15 and October 15,
                                              commencing October 15, 2005

Optional redemption.........................  The senior exchange notes due 2008
                                              are not redeemable prior to
                                              maturity.

                                              Until April 15, 2003, we can
                                              choose to redeem up

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                                       10
<PAGE>

--------------------------------------------------------------------------------

                                               to an aggregate of 35% of the sum
                                               of the original principal amount
                                               or accreted value of the senior
                                               exchange notes due 2010, the
                                               senior discount exchange notes
                                               due 2010 and the euro exchange
                                               notes, and the original principal
                                               amount or accreted value of any
                                               other notes issued under the same
                                               indentures with money we raise in
                                               certain equity offerings, if:

                                               o    we pay a redemption price
                                                    of 112.75%, 114.75% and
                                                    112.75% of the principal
                                                    amount or accreted value of
                                                    the senior exchange notes
                                                    due 2010, the senior
                                                    discount exchange notes due
                                                    2010 and the euro exchange
                                                    notes, respectively, we
                                                    redeem, plus accrued but
                                                    unpaid interest to the date
                                                    of redemption;

                                              o     at least 65% of the
                                                    original aggregate principal
                                                    amount or accreted value of
                                                    the senior exchange notes
                                                    due 2010, the senior
                                                    discount exchange notes due
                                                    2010 and the euro exchange
                                                    notes, and any other notes
                                                    issued under the same
                                                    indentures, remains
                                                    outstanding after each
                                                    redemption; and

                                              o     the redemption is made
                                                    within 90 days of the
                                                    closing of the related
                                                    equity offering.

                                               On or after April 15, 2005, we
                                               can redeem some or all of the
                                               senior exchange notes due 2010,
                                               the senior discount exchange
                                               notes due 2010 and the euro
                                               exchange notes at various prices
                                               plus accrued but unpaid interest
                                               to the date of redemption.

Change of control...........................   Upon a change of control, each
                                               holder of exchange notes may
                                               require us to repurchase his, her
                                               or its notes at 101% of the
                                               relevant principal amounts of the
                                               notes on the date of repurchase,
                                               plus accrued and unpaid interest,
                                               if any, on such amount to the
                                               date of repurchase.

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                                       11
<PAGE>

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Ranking.....................................   The exchange notes will be our
                                               senior obligations, ranking
                                               equally in right of payment with
                                               any of our senior indebtedness,
                                               and will be senior in right of
                                               payment to all of our existing
                                               and any future subordinated
                                               indebtedness. As of March 31,
                                               2000, after giving pro forma
                                               effect to the exchange offer and
                                               consent solicitation, the private
                                               placement and the tender offer
                                               and consent solicitation which
                                               occurred in April 2000, the
                                               borrowing of $1.15 billion under
                                               the Bank facility, the payment of
                                               outstanding debt under our former
                                               facility with Lucent and the
                                               exchange of 98.7% of our Series C
                                               preferred stock for senior notes
                                               due 2010 and senior discount
                                               notes due 2010, our senior
                                               indebtedness was approximately
                                               $2,771.2 million, of which
                                               $1,150.3 million was secured.

                                               The exchange notes will be our
                                               unsecured obligations. Our
                                               secured indebtedness, including:

                                               o     the Lucent facility and

                                               o     the Bank facility

                                               will be effectively senior to the
                                               exchange notes, to the extent of
                                               the value of the assets securing
                                               such indebtedness.

                                               The exchange notes will be
                                               effectively subordinated to all
                                               existing and future liabilities,
                                               including trade payables, of our
                                               subsidiaries. At March 31, 2000,
                                               after giving effect to the
                                               exchange offer and consent
                                               solicitation, private placement
                                               and tender offer and consent
                                               solicitation consummated in April
                                               2000, the Series C preferred
                                               stock exchange, the Bank facility
                                               and the repayment of outstanding
                                               debt under the former Lucent
                                               facility, our subsidiaries had
                                               approximately $1,843.4 million of
                                               liabilities (excluding
                                               intercompany payables to us and
                                               each other), including $1,415.0
                                               million of indebtedness.

Restrictive covenants.......................   Other than with respect to the
                                               indenture governing the senior
                                               subordinated deferred interest
                                               notes due 2007, the indentures
                                               governing the outstanding notes
                                               shall be the same indentures
                                               governing the exchange notes for
                                               which the outstanding notes are

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                                       12
<PAGE>

                                               exchanged. The indentures contain
                                               covenants that limit our ability
                                               to, among other things:

                                               o    incur additional
                                                    indebtedness;

                                               o    create liens;

                                               o    engage in sale-leaseback
                                                    transactions;

                                               o    pay dividends or make
                                                    distributions in respect of
                                                    our capital stock;

                                               o    redeem capital stock;

                                               o    make various types of
                                                    investments and other
                                                    restricted payments;

                                               o    sell assets;

                                               o    issue or sell stock of our
                                                    restricted subsidiaries; and

                                               o    enter into transactions
                                                    with stockholders or
                                                    affiliates or effect a
                                                    consolidation or merger.

                                               The indenture governing the
                                               outstanding series subordinated
                                               deferred interest notes due 2007
                                               does not contain most of the
                                               restrictive covenants that are
                                               contained in the indentures
                                               governing the other outstanding
                                               notes.

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                                       13
<PAGE>

                                  RISK FACTORS

      The exchange notes offered hereby involve a high degree of risk. Each
prospective purchaser should carefully consider the risks set forth in our
Annual Report on Form 10-K for the year ended December 31, 1999, as amended, and
the following risk factors.

Because we are a holding company, we will be dependent on dividends from our
operating subsidiaries and financings to make payments on the notes.

      We will not be able to make required payments on the notes unless we
derive the necessary proceeds from our subsidiaries or financings. We are a
holding company with no business operations of our own and our only material
assets are the stock of our operating subsidiaries and the proceeds raised from
sales of our securities, most of which we have loaned or contributed, or intend
to loan or contribute, to our subsidiaries. We will have to rely upon dividends
and other payments from our subsidiaries or proceeds from future sales of our
securities to generate the funds necessary to pay the principal of and interest
on the notes. Our subsidiaries, however, are not obligated to pay amounts due on
the notes or to make funds available for these payments. Our subsidiaries may
not be able to generate cash flow sufficient to pay a dividend or distribute
funds to us. Further, applicable state law and contractual restrictions, such as
restrictions in our subsidiaries' debt instruments including the Lucent facility
and the Bank facility, could prohibit such dividends or distributions.

We will not be able to fulfill our financial obligations under the notes if our
business does not grow as planned.

      If our business is not successful, we will not be able to generate enough
cash from our operations to repay our debt, including the notes, when required.
If we do not grow our business as planned and generate the necessary cash from
this business, we would have to either:

      o     refinance our debt;

      o     access other sources of capital, if they are even available to us;
            or

      o     default on our obligations.

      Any refinancing or raising of additional capital, if available, might be
on unfavorable terms in these circumstances. Any default on our financial
obligations could force us to diminish or halt our operations or liquidate our
assets.

We must satisfy our obligations to our subsidiaries' creditors before we will be
able to satisfy our obligations to the holders of the notes.

      Claims of creditors of our subsidiaries, including trade creditors and
creditors under our credit facilities, will have priority as to substantially
all of the assets of our subsidiaries over the holders of our indebtedness,
including the notes. Accordingly, the notes will be effectively subordinated to
all liabilities (including trade payables) of our subsidiaries. At March 31,
2000, after giving effect to the exchange offer and consent solicitation, the
private placement and tender


                                       14
<PAGE>

offer and consent solicitation consummated in April 2000, and the Series C
preferred stock exchange, the Bank facility and the repayment of outstanding
debt under our the former Lucent facility, our subsidiaries had approximately
$1,843.4 million of liabilities (excluding intercompany payables to us and each
other), including $1,415.0 million of indebtedness.

Virtually all of our assets are pledged to secure the obligations of our
subsidiaries under the Bank facility and the Lucent facility.

      To secure the obligations of our subsidiaries under the Bank facility and
the Lucent facility, (i) we and most of our subsidiaries have pledged our and
their assets to the Bank lenders and (ii) the borrower under the Lucent facility
has granted the lenders under the Lucent facility a security interest in all
equipment and other items purchased with the proceeds of loans under that
facility. The pledges to the Bank lenders include pledges by each of such
subsidiaries that owns stock of another subsidiary of that stock (other than the
stock of the borrower under the Lucent facility, which has been pledged to the
lenders thereunder). As the notes are our unsecured obligations, in the event of
a default, the holders of the notes would participate only in the residual value
of the pledged assets after satisfaction of the obligations to the respective
lenders under the Bank facility and the Lucent facility.

If we undergo a change of control, we may not have the ability to raise the
funds necessary to finance the change of control offer required by the
indentures governing the notes.

      If we undergo a change of control, we may need to refinance large amounts
of our debt, including the notes and borrowings under the Lucent facility and
the Bank facility. Under the indentures governing the notes, if a change of
control occurs, we must offer to buy back the notes for a price equal to 101% of
the relevant principal amount of the notes plus any accrued and unpaid interest.
We cannot assure you that there will be sufficient funds available for us to
make any required repurchases of the notes upon a change of control. In
addition, our credit facilities will prohibit us from repurchasing the notes
until we first repay such obligations in full. If we fail to repurchase the
notes in that circumstance, we will go into default under the indenture
governing the notes, the Lucent facility and the Bank facility. Any future debt
which we incur may also contain restrictions on repayment upon a change of
control. If any change of control occurs, we cannot assure you that we will have
sufficient funds to satisfy all of our debt obligations. These buyback
requirements may also delay or make it harder for others to effect a change of
control.

Do not place undue reliance on forward-looking statements contained in this
prospectus.

      Some of the statements under "Summary" and "Risk Factors" and elsewhere in
this prospectus are forward-looking statements that involve risks and
uncertainties. These forward-looking statements include statements about our
plans, objectives, expectations, intentions and assumptions and other statements
contained in this prospectus that are not statements of historical fact. You can
identify these statements by words such as "may," "will," "should," "estimates,"
"plans," "expects," "believes," "intends" and similar expressions. We cannot
guarantee future results, levels of activity, performance or achievements. Our
actual results and the timing of certain events may differ significantly from
the results discussed in the forward-looking statements. Factors that might
cause such a discrepancy include those discussed


                                       15
<PAGE>

in "Risk Factors" and elsewhere in this prospectus. You are cautioned not to
place undue reliance on any forward-looking statements.

                               THE EXCHANGE OFFER

Purpose and effect of the exchange offer

      We are making this exchange offer to comply with the requirements of
registration rights agreements which apply to certain of the outstanding notes.
Although not obligated to do so, we are also extending this exchange offer to
the other outstanding notes to which this prospectus relates. Other than the
exchange notes issued directly in exchange for our senior subordinated deferred
interest notes due 2007, the exchange notes will have terms substantially
identical to the outstanding notes, except that the exchange notes will not
contain terms with respect to transfer restrictions, registration rights and
additional interest for failure to observe specified obligations in the
registration rights agreements.

      Following the consummation of the exchange offer, any outstanding notes
not tendered will no longer have registration rights and will continue to be
subject to certain restrictions on transfer. Accordingly, the liquidity of the
market for the outstanding notes could be adversely affected.

Resale of exchange notes

      We are not requesting, and do not intend to request, an interpretation by
the staff of the SEC with respect to whether the exchange notes issued in
exchange for the outstanding notes may be offered for sale, resold or otherwise
transferred by you without compliance with the registration and prospectus
delivery provisions of the Securities Act. Based on interpretations by the staff
of the SEC set forth in no-action letters issued to third parties, we believe
that the exchange notes may be offered for resale, resold and otherwise
transferred by you unless you are a broker-dealer, as set forth below, without
compliance with the registration and prospectus delivery provisions of the
Securities Act, provided that, among other things:

      o     you acquire the exchange notes in the ordinary course of your
            business; and

      o     you have no arrangement or understanding with any person to
            participate in the distribution of the exchange notes.

      If you tender in the exchange offer for the purpose of participating in a
distribution of the exchange notes, you may not rely on the interpretations by
the staff of the SEC and must comply with the registration and prospectus
delivery requirements of the Securities Act in connection with any secondary
resale transaction.

      Each broker-dealer that receives exchange notes for its own account in
exchange for outstanding notes, where such outstanding notes were acquired by
the broker-dealer as a result of market-making activities or other trading
activities, must acknowledge that it will deliver a prospectus in connection
with any resale of such exchange notes.


                                       16
<PAGE>

Terms of the exchange offer

      Upon the terms set forth in this prospectus and in the letter of
transmittal, we will accept any and all outstanding notes properly tendered and
not withdrawn prior to 5:00 p.m., New York City time, on the expiration date.
You may tender some or all of your outstanding notes in the exchange offer.
However, outstanding notes may be tendered only in multiples of $1,000 principal
amount ((euro)1,000 in the case of the euro notes). Except with respect to
exchange notes issued in exchange for senior subordinated deferred interest
notes due 2007, we will issue $1,000 of principal amount of exchange notes
((euro)1,000 in the case of the euro exchange notes) in exchange for each $1,000
principal amount of outstanding notes ((euro)1,000 in the case of the euro
notes) accepted in the exchange offer. Holders of senior subordinated deferred
interest notes due 2007 who elect to exchange such notes for senior exchange
notes due 2010 and senior discount exchange notes due 2010 will receive, for
each $1,000 principal amount of senior subordinated deferred interest notes due
2007, $1,545.91 principal amount of senior exchange notes due 2010 and $_____
principal amount at issuance of senior discount notes due 2010, a portion of
which may constitute taxable income for U.S. holders as discussed under "Certain
United States Federal Income Tax Considerations." Such exchange is at the same
rate received by holders of our Series C preferred stock who are parties to the
agreements relating to the preferred stock transaction described elsewhere in
this prospectus.

      Other than the exchange notes issued in exchange for our senior
subordinated deferred interest notes due 2007, the form and terms of the
exchange notes will be substantially identical to the form and terms of the
outstanding notes for which they are exchanged, except that the exchange notes
(including those issued in exchange for the senior subordinated deferred
interest notes due 2007) will be registered under the Securities Act, will not
bear legends restricting their transfer and, for those outstanding notes subject
to a registration rights agreement, will not provide for any additional interest
upon the failure on our part to fulfill our obligations under the registration
rights agreements to file, and cause to be effective, a registration statement.
Except with respect to exchange notes issued in exchange for senior subordinated
deferred interest notes due 2007, the exchange notes will evidence the same debt
as the outstanding notes. Except with respect to exchange notes issued in
exchange for senior subordinated deferred interest notes due 2007, the exchange
notes will be issued under and entitled to the benefits of the same indentures
that authorized the issuance of the outstanding notes.

      The exchange offer is not conditioned upon any minimum amount of
outstanding notes of any series being tendered for exchange.

      We intend to conduct the exchange offer in accordance with the applicable
provisions of the registration rights agreements, the applicable requirements of
the Securities Act and the Securities Exchange Act of 1934 and the rules and
regulations of the SEC.

      We will be deemed to have accepted properly tendered outstanding notes
when we have given oral or written notice of the acceptance to the exchange
agent. The exchange agent will act as agent for you for the purpose of receiving
the exchange notes from us and delivering them to you. If any of the outstanding
notes that you tender are not accepted for exchange, they will be returned,
without expense, to you promptly after the expiration date.


                                       17
<PAGE>

      You will not be required to pay brokerage commissions or fees or, subject
to the instructions in the letter of transmittal, transfer taxes with respect to
the exchange offer. We will pay all charges and expenses, other than certain
taxes, in connection with the exchange offer.

Expiration date

      The expiration date shall be 5:00 p.m., New York City time, on _________,
2000 unless we, in our sole discretion, extend the exchange offer. Although we
have no current intention to extend the exchange offer, we reserve the right to
extend the exchange offer at any time and from time to time by giving oral or
written notice to the exchange agent and by timely public announcement
communicated, unless otherwise required by applicable law or regulation, by
making a release to the Dow Jones News Service. During any extension of the
exchange offer, all outstanding notes previously tendered in the exchange offer
and not withdrawn will remain subject to the exchange offer. The date of the
exchange for outstanding notes that are validly tendered will be the first New
York Stock Exchange trading day following the expiration date.

Amendments

      We expressly reserve the right to:

      o     delay acceptance for exchange any outstanding notes;

      o     terminate the exchange offer and not accept for exchange any
            outstanding notes if any of the events set forth below under
            "-- Conditions to the exchange offer" shall have occurred and shall
            not have been waived by us; and

      o     amend the terms of the exchange offer in any manner which, in our
            good faith judgment, is advantageous to the holders of the
            outstanding notes, whether before or after any tender of the
            outstanding notes.

      Any delay in acceptance, extension, termination or amendment will be
followed as promptly as practicable by oral or written notice to the registered
holders of outstanding notes. If we amend the exchange offer in a manner that we
determine to constitute a material change, we will promptly disclose the
amendment in a manner reasonably calculated to inform the holders of outstanding
notes of the amendment.

      Without limiting the manner in which we may choose to make public
announcements of any delay in acceptance, extension, termination or amendment of
the exchange offer, we shall have no obligation to publish, advertise, or
otherwise communicate any public announcement, other than by making a timely
release to a financial news service.

Conditions to the exchange offer

      Despite any other term of the exchange offer, we will not be required to
accept for exchange, or exchange any exchange notes for, any outstanding notes,
and we may terminate the exchange offer as provided in this prospectus before
accepting any outstanding notes for exchange if in our reasonable judgment:


                                       18
<PAGE>

      o     the exchange notes to be received will not be tradeable by the
            holder, without restriction under the Securities Act, the Securities
            Exchange Act of 1934 and without material restrictions under the
            blue sky or securities laws of substantially all of the states of
            the United States;

      o     the exchange offer, or the making of any exchange by a holder of
            outstanding notes, would violate applicable law or any applicable
            interpretation of the staff of the SEC; or

      o     any action or proceeding has been instituted or threatened in any
            court or by or before any governmental agency with respect to the
            exchange offer that, in our judgment, would reasonably be expected
            to impair our ability to proceed with the exchange offer.

      These conditions are for our sole benefit and we may assert them
regardless of the circumstances that may give rise to them or waive them, in
whole or in part, at any or at various times. A failure on our part to exercise
any of the foregoing rights will not constitute a waiver of such right.

Procedures for tendering

      Your tender to us of outstanding notes under one of the procedures set
forth below will constitute an agreement between you and Winstar in accordance
with the terms of this prospectus and the letter of transmittal.

      To tender your outstanding notes, you must:

      o     complete, sign and date the letter of transmittal, or a facsimile
            copy; have the signature on the letter of transmittal guaranteed if
            the letter of transmittal so requires; and mail or deliver the
            letter of transmittal or facsimile to the exchange agent prior to
            the expiration date; or

      o     comply with the procedure for book-entry transfer described below.

      In addition:

      o     the exchange agent must have received your outstanding notes along
            with the letter of transmittal; or

      o     the exchange agent must have received, prior to the expiration date,
            a timely confirmation of book-entry transfer of your outstanding
            notes into the exchange agent's account at DTC according to the
            procedure for book- entry transfer described below; or

      o     you must comply with the guaranteed delivery procedures described
            below.


                                       19
<PAGE>

      If tendered outstanding notes are registered in the name of the signer of
the letter of transmittal and the exchange notes are to be issued, and any
untendered outstanding notes are to be reissued, in the name of the registered
holder, the signature of such signer need not be guaranteed.

      In any other case, the tendered outstanding notes must be endorsed or
accompanied by written instruments of transfer in form satisfactory to us and
duly executed by the registered holder and the signature on the endorsement or
instrument of transfer must be guaranteed by a member firm of a registered
national securities exchange or of the National Association of Securities
Dealers, Inc., a commercial bank or trust company having an office or
correspondent in the United States or an "eligible guarantor institution" as
defined by Rule 17Ad-15 under the Exchange Act. If the exchange notes and any
outstanding notes not exchanged are to be delivered to an address other than
that of the registered holder appearing on the register for the outstanding
notes, the signature in the letter of transmittal must be guaranteed.

      The method of delivery of outstanding notes, letter of transmittal and all
other documents is at your election and risk. If delivery is made by mail, it is
recommended that registered mail, properly insured, with return receipt
requested, be used. In all cases, sufficient time should be allowed to assure
timely delivery. No letter of transmittal or outstanding notes should be sent to
us.

      The exchange agent and DTC have confirmed that any financial institution
that is a participant in DTC's system may use DTC's Automated Tender Offer
Program to tender. Participants in the program may, instead of physically
completing and signing the letter of transmittal and delivering it to the
exchange agent, transmit their acceptance of the exchange offer electronically.
They may do so by causing DTC to transfer the outstanding notes to the exchange
agent in accordance with its procedures for transfer. DTC will then send an
agent's message to the exchange agent confirming the transfer.

      Your tender will be deemed to have been received as of the date when:

      o     your properly completed and duly signed letter of transmittal
            accompanied by your outstanding notes, or a confirmation of
            book-entry transfer of your outstanding notes into the exchange
            agent's account at DTC, is received by the exchange agent, or

      o     your notice of guaranteed delivery or letter, telegram or facsimile
            transmission to similar effect from an eligible institution is
            received by the exchange agent.

      All questions as to the validity, form, eligibility, including time of
receipt, and acceptance for exchange of any tender of outstanding notes will be
determined by us, with our determination being final and binding. We reserve the
absolute right to reject any or all tenders not in proper form or the acceptance
for exchange of which may, in our counsel's opinion, be unlawful. We also
reserve the absolute right to waive any of the conditions of the exchange offer
or any defect or irregularity in the tender of any outstanding notes.


                                       20
<PAGE>

      Neither the exchange agent, us, nor any other person will be under any
duty to give notification of any defects or irregularities in tenders or incur
any liability for failure to give any such notification. If any outstanding
notes received by the exchange agent are not validly tendered by you and as to
which the defects or irregularities have not been cured or waived, or if
outstanding notes are submitted in a principal amount greater than the principal
amount of outstanding notes being tendered by you, such unaccepted or
non-exchanged outstanding notes will be returned to you by the exchange agent,
unless otherwise provided in the letter of transmittal, as soon as practicable
following the expiration date.

      We reserve the right in our sole discretion, to the extent permitted by
the indentures and applicable law to:

      o     purchase or make offers for any outstanding notes that remain
            outstanding subsequent to the expiration date; and

      o     purchase outstanding notes in the open market, in privately
            negotiated transactions or otherwise.

The terms of any purchases or offers made after the expiration of the exchange
offer may differ from the terms of the exchange offer.

      We will determine in our sole discretion all questions as to the validity,
form, eligibility, including time of receipt, and acceptance and withdrawal of
tendered outstanding notes. Our determination will be final and binding on all
parties. We reserve the absolute right to reject any outstanding notes not
properly tendered or any outstanding notes our acceptance of which would, in the
opinion of our counsel, be unlawful. We also reserve the right to waive any
defects, irregularities or conditions of tender as to any outstanding notes. Our
interpretation of the terms and conditions of the exchange offer, including the
instructions in the letter of transmittal, will be final and binding on all
parties.

      Unless waived, any defects or irregularities in connection with tenders of
outstanding notes must be cured within a time that we shall determine. Although
we intend to notify holders of defects or irregularities with respect to the
tenders of their outstanding notes, neither us, the exchange agent nor any other
person will incur any liability for failure to give such notification. Tenders
of outstanding notes will not be deemed made until such defects or
irregularities have been cured or waived. Any outstanding notes received by the
exchange agent that are not properly tendered and as to which the defects or
irregularities have not been cured or waived will be returned to the exchange
agent without cost to the tendering holder, unless otherwise provided in the
letter of transmittal, as soon as practicable following the expiration date.

Book-entry transfer

      The exchange agent will make a request to establish an account with
respect to the outstanding notes at DTC for purposes of the exchange offer
promptly after the date of this prospectus; and any financial institution
participating in DTC's system may make book-entry delivery of outstanding notes
by causing DTC to transfer the outstanding notes into the exchange agent's
account at DTC in accordance with DTC's procedures for transfer. Holders of


                                       21
<PAGE>

outstanding notes who are unable to deliver confirmation of the book-entry
tender of their outstanding notes into the exchange agent's account at DTC or
all other documents required by the letter of transmittal to the exchange agent
on or prior to the expiration date must tender their outstanding notes according
to the guaranteed delivery procedures described below.

Guaranteed delivery procedures

      If you desire to accept the exchange offer and time will not permit a
letter of transmittal or outstanding notes to reach the exchange agent before
the expiration date or the procedure for book-entry transfer cannot be completed
on a timely basis, a tender may be effected if the exchange agent has received
at its office, on or prior to the expiration date, a letter, telegram or
facsimile transmission from an eligible institution setting forth:

      o     the name and address of the tendering holder;

      o     the name(s) in which the outstanding notes are registered;

      o     the certificate number(s) of the outstanding notes to be tendered;
            and

      o     a statement that the tender is being made and guaranteeing that,
            within three New York Stock Exchange trading days after the date of
            execution of the letter, telegram or facsimile transmission by the
            eligible institution, the outstanding notes, in proper form for
            transfer, or a confirmation of book-entry transfer of such
            outstanding notes into the exchange agent's account at DTC, will be
            delivered by the eligible institution, together with a properly
            completed and duly executed letter of transmittal as well as any
            other required documents.

      Unless you tender your outstanding notes by one of the above-described
methods within the time period set forth above accompanied or preceded by a
properly completed letter of transmittal as well as any other required
documents, we may, at our option, reject the tender. Copies of a notice of
guaranteed delivery which may be used by eligible institutions for the purposes
described in this paragraph are available from the exchange agent.

      Issuances of exchange notes in connection with a notice of guaranteed
delivery or letter, telegram or facsimile transmission to similar effect by an
eligible institution will be made only against submission of a duly signed
letter of transmittal, and any other required documents, and deposit of the
tendered outstanding notes.

Terms and conditions of the letter of transmittal

      Under the terms of the letter of transmittal, if you tender outstanding
notes:

      o     you agree to exchange, assign and transfer the outstanding notes to
            us;

      o     you irrevocably appoint the exchange agent as your agent and
            attorney-in-fact to cause the outstanding notes to be assigned,
            transferred and exchanged;


                                       22
<PAGE>

      o     you represent and warrant that you have full power and authority to
            tender, exchange, assign and transfer the outstanding notes and to
            acquire exchange notes issued in the exchange offer;

      o     you represent and warrant that when the outstanding notes are
            accepted for exchange, Winstar will acquire good and unencumbered
            title to the tendered outstanding notes, free and clear of all
            liens, restrictions, charges and encumbrances and not subject to any
            adverse claim;

      o     you represent and warrant that you will, upon request, execute and
            deliver any additional documents deemed by us to be necessary or
            desirable to complete the exchange, assignment and transfer of
            tendered outstanding notes or transfer ownership of such outstanding
            notes on the account books maintained by DTC; and

      o     you agree that all authority conferred by you pursuant to the Letter
            of Transmittal will survive your death, bankruptcy or incapacity and
            each of your obligations will be binding upon your heirs, legal
            representatives, successors, assigns, executors and administrators.

Withdrawal of tenders

      Tenders of outstanding notes may be withdrawn at any time prior to 5:00
p.m., New York City time, on the expiration date.

      To be effective, a written, telegraphic, or facsimile transmission notice
of withdrawal must be received by the exchange agent at the address set forth in
the letter of transmittal prior to 5:00 p.m., New York City time on the
expiration date. Any notice of withdrawal must specify:

      o     the name of the holder originally listed in the letter of
            transmittal;

      o     the certificate numbers of the outstanding notes to be withdrawn,
            and the principal amount of outstanding notes delivered for
            exchange;

      o     a statement that the holder is withdrawing election to have the
            applicable outstanding notes exchanged; and

      o     the name of the registered holder of the outstanding notes.

      The notice must be signed by the holder in the same manner as the original
signature on the letter of transmittal, including any required signature
guarantees, or be accompanied by evidence satisfactory to us that the person
withdrawing the tender has succeeded to the beneficial ownership of the
outstanding notes being withdrawn. The exchange agent will return the properly
withdrawn outstanding notes promptly following the receipt of notice of
withdrawal. If outstanding notes have been tendered following the procedure for
book-entry transfer, any notice of withdrawal must specify the name and number
of the account at DTC to be credited with the withdrawn outstanding notes or
otherwise comply with DTC procedure.


                                       23
<PAGE>

Exchange agent

      United Trust Company of New York has been appointed as exchange agent for
the exchange offer. You should direct questions and requests for assistance,
requests for additional copies of this prospectus or of the letter of
transmittal and requests for notices of guaranteed delivery to the exchange
agent addressed as follows:

Registered, Certified or Regular Mail:   By Overnight Courier:

United States Trust Company of New York  United States Trust Company of New York
P.O. Box 844                             770 Broadway-13th Floor
Cooper Station                           Corporate Trust Operations Department
New York, New York 10276-0844            New York, New York 10003
                                         Attn: Corporate Trust Operations Dept.

By Hand Delivery:                        By Facsimile (for Eligible Institutions
                                         only):

United States Trust Company of New York  United States Trust Company of New York
111 Broadway, Lower Level                (212) 420-6152
New York, New York 10006                 Confirm by telephone (800) 548-6565
Attn: Corporate Trust Services

      Delivery of a letter of transmittal to any address or facsimile number
other than one set forth above will not constitute a valid delivery.

Fees and expenses

      We will bear the expense of soliciting tenders. The principal solicitation
is being made by mail. However, additional solicitations may be made by
telegraph, telephone or in person by our officers and regular employees of our
affiliates. No additional compensation will be paid to any of these officers and
employees who engage in soliciting tenders.

      We have not retained any dealer-manager or other soliciting agent in
connection with the exchange offer and will not make any payments to brokers,
dealers or others soliciting acceptances of the exchange offer. We, however,
will pay the exchange agent reasonable and customary fees for its services and
will reimburse it for its reasonable out-of-pocket expenses in connection with
the exchange. We may also pay brokerage houses and other custodians, nominees
and fiduciaries the reasonable out-of-pocket expenses incurred by them in
forwarding copies of this prospectus, the letter of transmittal and related
documents to the beneficial owners of the outstanding notes and in handling or
forwarding tenders for exchange.

      We will pay all the cash expenses to be incurred by us in connection with
the exchange offer, including fees and expenses of the exchange agent and
trustee and accounting and legal fees, will be paid by us. We will not, however,
pay the costs incurred by a holder in delivering its outstanding notes to the
exchange agent, underwriting fees, commissions or transfer taxes.


                                       24
<PAGE>

Transfer taxes

      Holders who tender their outstanding notes for exchange will not be
required to pay any transfer taxes. However, holders who instruct us to register
exchange notes in the name of, or request that outstanding notes not tendered or
not accepted in the exchange offer be returned to, a person other than the
registered tendering holder will be required to pay any applicable transfer tax.

Consequences of failure to exchange

      If you do not exchange your outstanding notes for exchange notes, you will
remain subject to the restrictions on transfer of the outstanding notes:

      o     as set forth in the legend printed on the notes as a consequence of
            the issuance of the outstanding notes pursuant to the exemptions
            from, or in transactions not subject to, the registration
            requirements of the Securities Act and applicable state securities
            laws; and

      o     otherwise set forth in the offering circular distributed in
            connection with the private offering of the outstanding notes (or,
            in the case of the senior subordinated deferred interest notes due
            2007, the offering circular distributed in connection with the
            private offering of the Series C preferred stock).

      In general, you may not offer or sell the outstanding notes unless they
are registered under the Securities Act, or if the offer or sale is exempt from
registration under the Securities Act and applicable state securities laws.
Except as required by the registration rights agreements, we do not intend to
register resales of the outstanding notes under the Securities Act. Based on
interpretations of the SEC, the exchange notes may be freely offered for resale,
resold or otherwise transferred by their holders, subject to certain
requirements discussed above.

Accounting treatment

      Except with respect to the senior subordinated deferred interest notes due
2007, the exchange notes will generally be recorded at the same carrying value
as the outstanding notes as reflected in our accounting records on the date of
the exchange because the exchange of the outstanding notes for the exchange
notes is the completion of the selling process contemplated in the issuance of
the outstanding notes. Accordingly, no gain or loss for accounting purposes will
be recognized. The expenses of the exchange offer and the unamortized expenses
related to the issuance of the outstanding notes will be amortized over the term
of the exchange notes.

Use of proceeds

      We will not receive any cash proceeds from the issuance of the exchange
notes offered in this registration statement. In consideration for issuing the
exchange notes as contemplated in this prospectus, we will receive the
corresponding outstanding notes or senior subordinated deferred


                                       25
<PAGE>

interest notes due 2007 in the case of the exchange of such notes for senior
notes due 2010 and senior discount notes due 2010. Outstanding notes surrendered
in exchange for exchange notes will be retired and canceled and cannot be
reissued. The issuance of the exchange notes (other than the senior exchange
notes due 2010 and senior discount exchange notes due 2010 exchanged for senior
subordinated deferred interest notes due 2007) will not result in a change in
our indebtedness. The exchange of senior exchange notes due 2010 and senior
discount exchange notes due 2010 for senior subordinated deferred interest notes
due 2007 will increase our indebtedness by $3.3 million (assuming all $2.2
million principal amount of the latter notes not previously exchanged are
exchanged in the exchange offer).

Other matters

      Participation in the exchange offer is voluntary and you should carefully
consider whether to accept. You are urged to consult your financial and tax
advisors in making your decisions on what action to take.

      No person has been authorized to give any information or to make any
representations in connection with the exchange offer other than those contained
in this prospectus. If given or made, such information or representations should
not be relied upon as having been authorized by us. Neither the delivery of this
prospectus nor any exchange made hereunder shall, under any circumstances,
create any implication that there has been no change in our affairs since the
dates as of which information is given. The exchange offer is not being made to,
nor will tenders be accepted from or on behalf of, holders of outstanding notes
in any jurisdiction in which the making of the exchange offer or its acceptance
would not be in compliance with the laws of such jurisdiction. However, we may,
at our discretion, take such action as we may deem necessary to make the
exchange offer in any such jurisdiction and extend the exchange offer to holders
of outstanding notes in such jurisdiction.

      As a result of the making of the exchange offer, we will have fulfilled a
covenant contained in some of the registration rights agreements. Holders of the
outstanding notes to which registration rights agreements apply who do not
tender their outstanding notes in the exchange offer will continue to hold
outstanding notes and will be entitled to all the rights and limitations
applicable under the indentures except for certain rights under the registration
rights agreements. All untendered outstanding notes will continue to be subject
to the restrictions on transfer set forth in the indentures and the outstanding
notes.


                                       26
<PAGE>

                              DESCRIPTION OF NOTES

      The outstanding notes were issued and the exchange notes will be issued
under indentures between us and United States Trust Company of New York, as
trustee. The indentures contain the full legal text of the matters described in
this section and other matters. Copies of the indentures have been filed as
exhibits to the registration statement of which this prospectus is a part. The
indentures are subject to and governed by the Trust Indenture Act of 1939. The
terms of the exchange notes will include those stated in the indentures and
those made part of the indentures by reference to the Trust Indenture Act.


                                       27
<PAGE>

      The following description is a summary of the material provisions of the
exchange notes and the indentures. It does not describe every aspect of the
exchange notes. We urge you read the indentures because they, and not this
description, define your rights as holder of the exchange notes.

      Other than the exchange notes issued directly in exchange for our senior
subordinated deferred interest notes due 2007, the terms of the exchange notes
will be identical to the terms of the outstanding notes for which they are
exchanged, except that the exchange notes will be free of restrictive legends.

Principal, maturity and interest

      Senior exchange notes due 2008

      In exchange for our outstanding senior notes due 2008 we will issue up to
a maximum aggregate principal amount of $325.0 million of our senior exchange
notes due 2008. The senior exchange notes due 2008 will mature on April 15,
2008.

      Interest on the senior exchange notes due 2008 will accrue at the annual
rate of 12 1/2% and will be payable semiannually in arrears on April 15 and
October 15, commencing on October 15, 2000. We will make each interest payment
to the holders of record of the senior exchange notes due 2008 on the
immediately preceding April 1 and October 1. We will pay interest on overdue
principal at 1% per annum in excess of the above rate and will pay interest on
overdue installments of interest at such higher rate to the extent lawful.

      Interest on the senior exchange notes due 2008 will accrue from the date
of original issuance. Interest will be computed on the basis of a 360-day year
comprised of twelve 30-day months.

      Senior exchange notes due 2010

      In exchange for our outstanding senior notes due 2010, we will issue up to
a maximum aggregate principal amount of $637.7 million of our senior exchange
notes due 2010. The senior exchange notes due 2010 will mature on April 15,
2010.

      We also will issue up to $1.3 million aggregate principal amount of our
senior exchange notes due 2010 and up to $3.9 million aggregate principal
amount of our senior discount exchange notes due 2010, in combination, in
exchange for up to $2.2 million of our outstanding senior subordinated deferred
interest notes due 2007.

      Interest on the senior exchange notes due 2010 will accrue at the annual
rate of 12 3/4% and will be payable semiannually in arrears on April 15 and
October 15, commencing on October 15, 2000. We will make each interest payment
to the holders of record of the senior exchange notes due 2010 on the
immediately preceding April 1 and October 1. We will pay interest on overdue
principal at 1% per annum in excess of the above rate and will pay interest on
overdue installments of interest at such higher rate to the extent lawful.


                                       28
<PAGE>

      Interest on the senior exchange notes due 2010 will accrue from the date
of original issuance. Interest will be computed on the basis of a 360-day year
comprised of twelve 30-day months

      Senior discount exchange notes due 2010

      In exchange for our outstanding senior discount notes due 2010, we will
issue up to a maximum aggregate accreted value, determined as of the issue date,
of $458.1 million of our senior discount exchange notes due 2010. As noted in
the preceding section, we will also issue senior discount exchange notes due
2010 upon the exchange of our senior subordinated deferred interest notes due
2007. The senior discount exchange notes due 2010 will mature on April 15, 2010.

      No cash interest will accrue on the senior discount exchange notes due
2010 prior to April 15, 2005, although, for U.S. Federal income tax purposes,
holders will recognize a significant amount of original issue discount, or OID,
as the original issue discount accrues. See "Certain United States Federal
Income Tax Considerations" for a discussion regarding the taxation of OID.

      Interest on the senior discount exchange notes due 2010 will accrue at the
annual rate of 14.75% from April 10, 2000. Cash interest on the senior discount
exchange notes due 2010 will be payable semiannually in arrears on April 15 and
October 15, commencing October 15, 2005. We will make each interest payment to
the holders of record of the senior discount exchange notes due 2010 on the
immediately preceding April 1 and October 1. Interest will be computed on the
basis of a 360-day year of twelve 30-day months.

      Euro exchange notes

      In exchange for our outstanding euro notes, we will issue up to a maximum
aggregate principal amount of (euro)200.0 million of our euro exchange notes.
The principal, maturity and interest terms of the euro exchange notes are the
same as the senior exchange notes due 2010.

Optional redemption

      Senior exchange notes due 2008

      The senior exchange notes due 2008 are not redeemable prior to maturity.

      Senior exchange notes due 2010, senior discount exchange notes due 2010
and euro exchange notes

      Except as set forth below, we will not be entitled to redeem the senior
exchange notes due 2010, the senior discount exchange notes due 2010 or the euro
exchange notes at our option prior to April 15, 2005. On and after April 15,
2005, we will be entitled at our option to redeem all or a portion of these
notes upon not less than 30 nor more than 60 days' notice, at the redemption
prices, expressed in percentages of principal amount, or in the case of senior
discount notes due 2010, in percentages of accreted value on the redemption
date, plus accrued interest to the redemption date, subject to the right of
holders of record on the relevant record date to receive


                                       29
<PAGE>

interest due on the relevant interest payment date, if redeemed during the
12-month period commencing on April 15 of the years set forth below:

Redemption Period                                                        Price
-----------------                                                        -----
2005...............................................................     106.375%
2006...............................................................     104.250
2007...............................................................     102.125
2008 and thereafter................................................     100.000

      In addition, before April 15, 2003, we may at our option on one or more
occasions redeem the senior exchange notes due 2010, the senior discount
exchange notes due 2010 and the euro exchange notes, which includes additional
notes of each series, if any, in an aggregate principal amount not to exceed 35%
of the aggregate principal amount of the notes of each series, which includes
additional notes of each series, if any, originally issued at a redemption
price, expressed as a percentage of principal amount, or in the case of the
senior discount notes due 2010, expressed as a percentage of accreted value, of
112.750%, 114.750% and 112.750% for the senior exchange notes due 2010, the
senior discount exchange notes due 2010 and the euro exchange notes,
respectively, plus accrued and unpaid interest to the redemption date, with the
net cash proceeds from one or more public equity offerings; provided, however,
that

      o     at least 65% of the aggregate principal amount of senior exchange
            notes due 2010, the senior discount exchange notes due 2010 and the
            euro exchange notes, which includes additional notes of each series,
            if any, remains outstanding immediately after the occurrence of each
            such redemption, other than any of such notes held, directly or
            indirectly, by us or our affiliates; and

      o     each redemption occurs within 90 days after the closing date of the
            related public equity offering.

Selection and notice of redemption

      If we are redeeming less than all of the senior exchange notes due 2010,
senior discount exchange notes due 2010 or euro exchange notes, at any time, the
applicable trustee will select senior exchange notes due 2010, senior discount
exchange notes due 2010 or euro exchange notes, as the case may be, on a pro
rata basis, by lot or by such other method as that trustee, in its sole
discretion, shall deem to be fair and appropriate.

      We will redeem exchange notes of $1,000 ((euro)1,000 in the case of the
euro exchange notes) or less in whole and not in part. We will cause notices of
redemption to be mailed by first-class mail at least 30 but not more than 60
days before the redemption date to each holder of exchange notes to be redeemed
at its registered address.

      If any exchange note is to be redeemed in part only, the notice of
redemption that relates to that note shall state the portion of the principal
amount to be redeemed. We will issue a note in principal amount equal to the
unredeemed portion of the original exchange note in the name of the holder upon
cancellation of the original exchange note. Exchange notes called for redemption


                                       30
<PAGE>

become due on the date fixed for redemption. On and after the redemption date,
interest ceases to accrue on exchange notes or portions of them called for
redemption.

Mandatory redemption

      We are not required to make any mandatory redemption or sinking fund
payments with respect to the exchange notes. However, under certain
circumstances, we may be required to offer to purchase exchange notes.

Open market purchases

      We may at any time, and from time to time, purchase the exchange notes in
the open market or otherwise.

Ranking

      Senior indebtedness versus exchange notes

      The indebtedness evidenced by the exchange notes will rank pari passu in
right of payment to all of our senior indebtedness, including any senior notes
due 2008, senior notes due 2010, senior discount notes due 2010, euro notes and
any 14% senior discount notes due 2005 not tendered in the tender offer. As of
March 31, 2000, after giving pro forma effect to the exchange offer and consent
solicitation, the private placement and the tender offer and consent
solicitation which occurred in April 2000, the borrowing of $1.15 billion under
the Bank facility, the payment of outstanding debt under our former facility
with Lucent, and the Series C preferred stock exchange, our Senior Indebtedness
would have been approximately $2,771.2 million, of which $1,150.3 million was
secured.

      The exchange notes are our unsecured obligations. Secured debt and other
secured obligations incurred by us from time to time, including obligations with
respect to the proposed credit facility and the Lucent facility will be
effectively senior to the exchange notes to the extent of the value of the
assets securing such debt or other obligations.

      Liabilities of subsidiaries versus exchange notes

      We are a holding company. Substantially all our operations are conducted
through our subsidiaries. Claims of creditors of our subsidiaries, including
trade creditors and creditors holding indebtedness or guarantees issued by our
subsidiaries, and claims of preferred stockholders of our subsidiaries generally
will have priority with respect to the assets and earnings of our subsidiaries
over the claims of our creditors, including holders of the exchange notes.
Accordingly, the exchange notes will be effectively subordinated to creditors,
including trade creditors, and preferred stockholders, if any, of our
subsidiaries.

      Although the indentures limit the incurrence of indebtedness and preferred
stock of certain of our subsidiaries, such limitations are subject to a number
of significant qualifications. Moreover, the indentures do not impose any
limitation on the incurrence by such subsidiaries of liabilities that are not
considered indebtedness under the indentures. As of March 31, 2000, after


                                       31
<PAGE>

giving pro forma effect to the exchange offer and consent solicitation, the
private placement and the tender offer and consent solicitation consummated in
April 2000, the borrowing of $1.15 billion under the Bank facility, the payment
of outstanding debt under our former facility with Lucent, and the Series C
preferred stock exchange, the total liabilities of our subsidiaries would have
been approximately $1,843.4 million, including trade payables. Although the
indenture limits the incurrence of Indebtedness and preferred stock of certain
of our subsidiaries, such limitations are subject to a number of significant
qualifications. Moreover, the indenture does not impose any limitation on the
incurrence by such subsidiaries of liabilities that are not considered
Indebtedness under the indenture.

Important differences between exchange notes and senior subordinated deferred
interest notes due 2007

      In addition to differences in interest rates, maturity and redemption
terms, there are other important differences between the senior subordinated
deferred interest notes due 2007 and the exchange notes being offered in
exchange therefor, including differences in restrictive covenants and default
provisions. The indenture governing the senior subordinated deferred interest
notes due 2007 has been amended to eliminate substantially all of the
restrictive covenants that are contained in the indentures governing the senior
exchange notes due 2010 and the senior discount exchange notes due 2010. Also,
as a result of such amendment, only the first four of the events described below
that constitute events of default with respect to such exchange notes constitute
events of default with respect to the senior subordinated deferred interest
notes due 2007.

Book-entry, delivery and form

      Senior exchange notes due 2008, senior exchange notes due 2010 and senior
discount exchange notes due 2010

      We will issue the senior exchange notes due 2008, the senior exchange
notes due 2010 and the senior discount exchange notes due 2010 in the form of
one or more global notes. The global notes will be deposited with, or on behalf
of, the depository and registered in the name of the depository or its nominee.
Except as set forth below, the global notes may be transferred, in whole and not
in part, only to the depository or a nominee of the depository. You may hold
your beneficial interests in a global note directly through the depository if
you have an account with the depository or indirectly through organizations
which have accounts with the depository.

      We expect that pursuant to procedures established by the depository, upon
the deposit of a global note with the depository, the depository will credit, on
its book-entry registration and transfer system, the principal amount of notes
represented by such global note to the accounts of participants.

      So long as the depository, or its nominee, is the registered holder and
owner of the global notes, the depository or such nominee, as the case may be,
will be considered the sole legal owner and holder of any related notes
evidenced by the global notes for all purposes of such notes and the applicable
indenture.


                                       32
<PAGE>

      We will make payments of principal of, premium, if any, and interest on
exchange notes represented by the global notes registered in the name of and
held by the depository or its nominee to the depository or its nominee, as the
case may be, as the registered owner and holder of the global notes.

      Euro exchange notes

      The euro exchange notes will be represented by one or more global notes.
Each of the global notes will be issued in registered form without coupons and
the global notes in aggregate represent the aggregate principal amount of the
euro exchange notes. Each global note will be deposited with, or on behalf of,
Citibank, N.A. as common depositary for the Euroclear System and for Clearstream
Banking, societe anonyme, formerly known as Cedelbank, and will be, registered
in the name of a nominee of the common depositary.

      Upon the issuance of a global note, Euroclear or Clearstream, Luxembourg,
as the case may be, will credit the accounts of persons holding through it with
the respective principal amounts represented by the global note. These accounts
will be limited to persons who have accounts with Euroclear or Clearstream,
Luxembourg or persons who may hold interests through participants. Ownership of
beneficial interests in a global note will be shown on, and the transfer of that
ownership interest will be effected only through, records maintained by
Euroclear or Clearstream, Luxembourg (with respect to participants' interests)
and such participants (with respect to the owners of beneficial interests in
such global notes other than participants). The global notes will not be
eligible for clearance through the depositary, except indirectly through the
depositary's participation in Euroclear and Clearstream, Luxembourg.

      Payment of principal and interest on euro exchange notes represented by a
global note will be made in immediately available funds to the common depositary
for Euroclear and Clearstream, Luxembourg or its nominee, as the case may be, as
the sole registered owner and the sole holder of the global notes represented
thereby for all purposes under the indenture. We have been advised by Euroclear
and Clearstream, Luxembourg that upon receipt of any payment of principal of or
interest on any global note, Euroclear and Clearstream, Luxembourg will
immediately credit, on its book-entry registration and transfer system, the
accounts of participants with payments in amounts proportionate to their
respective beneficial interests in the principal or face amount of such global
note as shown on the records of Euroclear and Clearstream, Luxembourg. Payments
by participants to owners of beneficial interests in a global note held through
such participants will be governed by standing instructions and customary
practices as is now the case with securities held for customer accounts
registered in "street name" and will be the sole responsibility of such
participants.

      Owners of beneficial interests in a global note who receive payment in any
currency other than euro must make foreign exchange conversion arrangements at
their own expense. Investors may be subject to foreign exchange risks that may
have important economic and tax consequences for them.

      So long as the common depositary for Euroclear and Clearstream, Luxembourg
or its nominee, as the case may be, is the registered owner of a global note,
Citibank, N.A. or such successor depositary or such party will be considered the
sole owner or holder of the euro


                                       33
<PAGE>

exchange notes represented by such global note for all purposes under the
indenture and the notes. Except as set forth above, owners of beneficial
interests in a global note will not be entitled to have the notes represented by
such global note registered in their names, will not receive or be entitled to
receive physical delivery of certificated euro exchange notes in definitive form
and will not be considered to be the owners or holders of any notes under such
global note. Accordingly, each person owning a beneficial interest in a global
note must rely on the procedures of Euroclear or Clearstream, Luxembourg, as the
case may be, and, if such person is not a participant, on the procedures of the
participant through which such person owns its interest, to exercise any rights
of a holder under the indenture. We understand that under existing industry
practices, in the event that we request any action of holders or that an owner
of a beneficial interest in a global note desires to give or take any action
which a holder is entitled to give or take under the indenture, Euroclear or
Clearstream, Luxembourg, as the case may be, would authorize the participants
holding the relevant beneficial interest to give or take such action and such
participants would authorize beneficial owners owning through such participants
to give or take such action or would otherwise act upon the instructions of
beneficial owners owning through them.

      We understand that Euroclear and Clearstream, Luxembourg each hold
securities for their account holders and facilitate the clearance and settlement
of securities transactions by electronic book-entry transfer between their
respective account holders, thereby eliminating the need for physical movements
of certificates and any risks from lack of simultaneous transfers of securities.

      Euroclear and Clearstream, Luxembourg each provide various services
including safekeeping, administration, clearance and settlement of
internationally traded securities and securities lending and borrowing.
Euroclear and Clearstream, Luxembourg each also deals with domestic securities
markets in several countries through established depository and custodial
relationships. The respective systems of Euroclear and Clearstream, Luxembourg
have established and electronic bridge between their two systems which enables
their respective account holders to settle trades with each other.

      Account holders in Euroclear and Clearstream, Luxembourg are world-wide
financial institutions including underwriters, securities brokers, and dealers,
banks, trust companies and clearing corporations. Indirect access to both
Euroclear and Clearstream, Luxembourg is available to other institutions that
clear through or maintain a custodial relationship with an account holder of
either system.

      An account holder's overall contractual relations with either Euroclear or
Clearstream, Luxembourg are governed by the respective rules and operating
procedures of Euroclear or Clearstream, Luxembourg and any applicable laws. Both
Euroclear and Clearstream, Luxembourg act under those rules and operating
procedures only on behalf of their respective account holders, and have no
record of or relationship with persons holding through their respective holders.

      Euroclear and Clearstream, Luxembourg, acting on behalf of their
respective participants, are expected, prior to each payment date, to elect to
receive payments of principal and interest and any other amounts owing
thereunder in respect of the book-entry interests in the global note in euro. In
the event that Euroclear and Clearstream, Luxembourg become unwilling or unable
to


                                       34
<PAGE>

make such an election on behalf of their participants, each individual holder of
a beneficial interest in the global note representing euro exchange notes will
be required to make its own currency election in order to avoid payment in U.S.
dollars.

Same-day payment

      Each indenture for the senior exchange notes due 2008, the senior exchange
notes due 2010 and the senior discount exchange notes due 2010 requires us to
make payments in respect of the applicable notes, including principal, premium
and interest, by wire transfer of immediately available funds to the U.S. dollar
accounts with banks in the U.S. specified by the holders thereof or, if no such
account is specified, by mailing a check to each such holder's registered
address. Similar provisions apply with respect to the euro exchange notes.

Change of control

      Upon the occurrence of certain events, each holder shall have the right to
require that we repurchase its exchange notes at a purchase price in cash equal
to 101% of the principal amount and, in the case of the senior discount exchange
notes due 2010, 101% of the accreted value, in each case as of the date of
purchase, plus in each case accrued and unpaid interest, if any, to the date of
purchase. This right is subject to the right of holders of record on the
relevant record date to receive interest due on the relevant interest payment
date.

Certain covenants

      The indentures governing the exchange notes contain covenants that limit
our ability to, among other things:

      o     incur additional indebtedness;

      o     create liens;

      o     engage in sale-leaseback transactions;

      o     pay dividends or make distributions in respect of their capital
            stock;

      o     redeem capital stock;

      o     make various types of investments and other restricted payments;

      o     sell assets;

      o     issue or sell stock of our restricted subsidiaries; and

      o     enter into transactions with stockholders or affiliates or, with
            respect to us, effect a consolidation or merger.


                                       35
<PAGE>

These covenants are subject to important exceptions and qualifications, which
are described in detail in the indentures.

Defaults

      Each of the following would constitute an event of default with respect to
the exchange notes:

      o     a default in the payment of interest on the notes of any series when
            due, continued for 30 days;

      o     a default in the payment of principal of any note of any series when
            due at its stated maturity, upon optional redemption, upon required
            purchase, upon declaration or otherwise;

      o     the failure by us to comply with our obligations respecting merger
            and consolidation transactions;

      o     certain events of bankruptcy, insolvency or reorganization of ours
            or to certain of our subsidiaries;

      o     any judgment or decree for the payment of money in excess of $25.0
            million is entered against us or to certain of our subsidiaries,
            remains outstanding for a period of 60 consecutive days following
            such judgment and is not discharged, waived or stayed;

      o     indebtedness of us or certain of our subsidiaries that is not paid
            within any applicable grace period after final maturity or is
            accelerated by the holders thereof because of a default and the
            total amount of such indebtedness unpaid or accelerated exceeds
            $25.0 million (the "cross acceleration provision");

      o     the failure by us to comply for 60 days after notice with our other
            agreements contained in the applicable indenture; or

      o     the failure by us to comply for 30 days after notice with any of our
            obligations with respect to change of control events (other than a
            failure to purchase the exchange notes) or with respect to various
            other covenants.

However, a default under the last two clauses will not constitute an event of
default until the applicable trustee or the holders of 25% in principal amount
of the outstanding exchange notes of the applicable series notify us of the
default and we do not cure the default within the time specified after receipt
of such notice.

      If an event of default occurs and is continuing, the applicable trustee or
the holders of at least 25% in principal amount of the outstanding exchange
notes of the applicable series may declare the principal or accreted value of
and accrued but unpaid interest on all the applicable notes to be due and
payable. Upon such a declaration, the default amount shall be due and


                                       36
<PAGE>

payable immediately. If an event of default relating to certain events of
bankruptcy, insolvency or reorganization of us occurs and is continuing, the
amount due on all the applicable exchange notes will ipso facto become and be
immediately due and payable without any declaration or other act on the part of
the applicable trustee or any holders of such notes. Under certain
circumstances, the holders of a majority in principal amount of any series of
outstanding exchange notes may rescind any such acceleration with respect to
such notes and its consequences.

Amendments and waivers

      Subject to certain exceptions, each indenture may be amended with the
consent of the holders of a majority in principal amount of the applicable
exchange notes then outstanding (including consents obtained in connection with
a tender offer or exchange for such notes) and any past default or compliance
with any provisions may also be waived with the consent of the holders of a
majority in principal amount of such notes then outstanding. However, without
the consent of each holder of an outstanding exchange note affected thereby, an
amendment may not, among other things:

      o     reduce the amount of notes whose holders must consent to an
            amendment;

      o     reduce the rate of or extend the time for payment of interest on any
            note;

      o     reduce the principal or accreted value of or extend the stated
            maturity of any note;

      o     reduce the amount payable upon the redemption of any note or change
            the time at which any note may be redeemed as described under
            "-- Optional Redemption";

      o     make any note payable in money other than that stated in the note;

      o     impair the right of any holder of the notes to receive payment of
            principal of and interest on such holder's notes on or after the due
            dates therefor or to institute suit for the enforcement of any
            payment on or with respect to such holder's notes;

      o     make any change in the amendment provisions which require each
            holder's consent or in the waiver provisions; or

      o     make any change in the ranking or priority of any note that would
            adversely affect the noteholders.

      Notwithstanding the preceding, without the consent of any holder of the
notes of a series, we and relevant trustee may amend the indenture governing
that series:

      o     to cure any ambiguity, omission, defect or inconsistency;

      o     to provide for the assumption by a successor corporation of our
            obligations under such indenture;


                                       37
<PAGE>

      o     to provide for uncertificated notes in addition to or in place of
            certificated notes (provided that the uncertificated notes are
            issued in registered form for purposes of Section 163(f) of the
            Code, or in a manner such that the uncertificated notes are
            described in Section 163(f)(2)(B) of the Code);

      o     to add guarantees with respect to the related notes or to secure
            such notes;

      o     to add to our covenants for the benefit of the holders of such notes
            or to surrender any right or power conferred upon us;

      o     to make any change that does not adversely affect the rights of any
            holder of such notes; or

      o     to comply with any requirement of the SEC in connection with the
            qualification of such indenture under the Trust Indenture Act.

      The consent of the holders of exchange notes is not necessary under an
indenture to approve the particular form of any proposed amendment. It is
sufficient if such consent approves the substance of the proposed amendment.

      After an amendment under an indenture becomes effective, we are required
to mail to holders of the related exchange notes a notice briefly describing the
amendment. However, the failure to give notice to all holders of the notes, or
any defect, will not impair or affect the validity of the amendment.

Transfer

      The exchange notes will be issued in registered form and will be
transferable only upon the surrender of the outstanding notes being transferred
for registration. We may require payment of a sum sufficient to cover any tax,
assessment or other governmental charge payable in connection with certain
transfers and exchanges.

Defeasance

      At any time, we may terminate all our obligations under a series of
exchange notes and the related indenture, except for certain obligations,
including those respecting the defeasance trust and obligations to register the
transfer or exchange of such notes, to replace mutilated, destroyed, lost or
stolen exchange notes and to maintain a registrar and paying agent in respect of
the exchange notes.

      In addition, at any time we may, with respect to a series of exchange
notes, terminate our obligations that are described under "-- Change of Control"
and under the covenants described under "-- Certain Covenants" (other than the
covenant relating to mergers and consolidations, the operation of certain cross
acceleration provisions, bankruptcy provisions with respect to us and certain of
our subsidiaries and certain judgment default provisions described covenant
defeasance).


                                       38
<PAGE>

      We may exercise our right to terminate our obligations under the exchange
notes and related indenture notwithstanding the prior exercise of our covenant
defeasance option. We may exercise either option with respect to one series of
exchange notes without exercising any option with respect to any other series of
exchange notes. If we exercise our right to terminate our obligations under the
exchange notes and related indenture, payment of the applicable exchange notes
may not be accelerated because of an event of default. If we exercise our
covenant defeasance option, payment of the applicable exchange notes may not be
accelerated, in some situations, because of certain events of default.

      In order to exercise either of our defeasance options with respect to a
series of exchange notes, we must irrevocably deposit in trust with the related
trustee, money, U.S. governmental obligations or European governmental
obligations for the payment of principal and interest on such notes to
redemption or maturity, as the case may be, and must comply with certain other
conditions, including delivery to such trustee of an opinion of counsel to the
effect that holders of such notes will not recognize income, gain or loss for
Federal income tax purposes as a result of such deposit and defeasance and will
be subject to Federal income tax on the same amounts and in the same manner and
at the same times as would have been the case if such deposit and defeasance had
not occurred. In the case of legal defeasance only, such opinion of counsel must
be based on a ruling of the Internal Revenue Service or other change in
applicable Federal income tax law. Money denominated in currency other than
euros and U.S. governmental obligations deposited pursuant to this paragraph
shall be subject in their entirety, including principal, interest and premium,
if any, to a customary currency agreement that is of a duration not less than
the defeasance period that fixes the exchange rate of such money or U.S.
governmental obligations into euros for the benefit of the trustee.

      The amount of such money and U.S. governmental obligations expressed in
euros will be as provided in such currency agreement. The counterparty to such
currency agreement shall be a commercial bank organized in the United States
having capital and surplus in excess of $500.0 million or a commercial bank
organized under the laws of any country that is a member of the OECD having
total assets in excess of $500.0 million, or its foreign currency equivalent at
the time. Such counterparty may obtain from us an opinion of counsel to the
effect that the currency agreement has been duly authorized and entered into by
us.

Concerning the trustee

      United States Trust Company of New York is the trustee under the
applicable indentures. We also have appointed United States Trust Company of New
York as registrar with regard to the exchange notes and paying agent with regard
to the senior exchange notes due 2008 under the senior exchange notes due 2008
indenture, the senior exchange discount due 2010 notes under the senior discount
exchange notes due 2010 indenture and the senior exchange notes due 2010 under
the senior exchange notes due 2010 indenture.

      Each indenture contains certain limitations on the rights of the related
trustee, should it become our creditor, to obtain payment of claims in certain
cases, or to realize on certain property received in respect of any such claim
as security or otherwise. The trustee will be permitted to engage in other
transactions; provided, however, if it acquires any conflicting interest it must


                                       39
<PAGE>

either eliminate such conflict within 90 days, apply to the SEC for permission
to continue or resign.

      The holders of a majority in principal amount of the outstanding exchange
notes of each series will have the right to direct the time, method and place of
conducting any proceeding for exercising any remedy available to the related
trustee, subject to certain exceptions. If an event of default under an
indenture occurs and is not cured, the applicable trustee will be required, in
the exercise of its power, to use the degree of care of a prudent man in the
conduct of his own affairs. Subject to such provisions, such trustee will be
under no obligation to exercise any of its rights or powers under the related
indenture at the request of any holder of such notes, unless such holder shall
have offered to such trustee security and indemnity satisfactory to it against
any loss, liability or expense and then only to the extent required by the terms
of such indenture.

Paying agent and registrar for the euro exchange notes

      With respect to the euro exchange notes, we have appointed United States
Trust Company of New York, as registrar and as paying agent in the United States
in respect of the global notes and Citibank (Luxembourg) S.A. as paying agent in
Luxembourg. We will ensure that for as long as any euro exchange notes are
outstanding, there will always be a registrar and a paying agent to perform the
functions assigned to them in the related indenture. We have agreed to appoint
the Luxembourg paying agent as transfer agent in the event the euro exchange
notes are issued in definitive registered form.

Listing of the euro exchange notes

      Application has been made to list the euro exchange notes on the
Luxembourg Stock Exchange. [Status?] So long as the euro exchange notes are
listed on the Luxembourg Stock Exchange and the rules of such exchange so
require, we will maintain a paying agent and transfer agent in Luxembourg. If
the euro exchange notes are listed on any other securities exchange, we will
satisfy any requirement at such securities exchange as to paying agents.

      In connection with the application to list the euro exchange notes on the
Luxembourg Stock Exchange, copies of our by-laws and a legal notice relating to
our issue of the notes will be deposited prior to listing with the Greffier en
Chef du Tribunal d'Arrondissement de et a Luxembourg, where they may be
inspected and copies obtained upon request.

Notices for the euro exchange notes

      So long as the euro exchange notes are listed on the Luxembourg Stock
Exchange and it is required by the rules of the Luxembourg Stock Exchange, we
will make publication of notices to the holders of the euro exchange notes in a
leading newspaper having general circulation in Luxembourg or, if such
publication is not practicable, in one other leading daily newspaper with
general circulation in Europe, such newspaper being published on each business
day in morning editions, whether or not it is published in Saturday, Sunday or
holiday editions. For so long as the euro exchange notes are listed on the
Luxembourg Stock Exchange, a copy of all notices will be provided by us to the
Luxembourg Stock Exchange.


                                       40
<PAGE>

Documents available

      So long as the euro exchange notes are listed on the Luxembourg Stock
Exchange, copies of the following documents will be available during usual
business hours at the specified office of Citibank (Luxembourg) S.A.: (a) the
indenture, incorporating the forms of the notes; and (b) our audited annual
financial statements.

No personal liability of directors, officers, employees and stockholders

      None of our directors, officers, employees, incorporators or stockholders
will have any liability for any of our obligations under the exchange notes or
the indentures or for any claim based on, in respect of, or by reason of such
obligations or their creation. Each holder of the exchange notes, by accepting a
note, waives and releases all such liability. The waiver and release are part of
the consideration for issuance of the exchange notes. Such waiver and release
may not be effective to waive liabilities under the U.S. Federal securities
laws, and it is the view of the SEC that such a waiver is against public policy.

Governing law

      Each exchange notes indenture and the exchange notes will be governed by,
and construed in accordance with, the laws of the State of New York without
giving effect to applicable principles of conflicts of law to the extent that
the application of the law of another jurisdiction would be required thereby.

          DESCRIPTION OF CERTAIN OTHER INDEBTEDNESS AND PREFERRED STOCK

Lucent facility

      In May 2000, our subsidiary, WVF-I LLC, entered into a new credit facility
with Lucent in an aggregate amount of $2.0 billion. This secured facility
replaced our former facility with Lucent. Up to $1.0 billion of our new Lucent
facility is available to us at any one time for the purchase of network
equipment and related services. The balance will become available as the first
$1.0 billion is refinanced or syndicated. We and WCI Capital Corp., our
subsidiary and the borrower under the Bank facility described below, are
guarantors of this facility. Amounts borrowed under the facility are secured by
a pledge of the equity of WVF-I and any additional or substitute borrower
thereunder and by a purchase money security interest in the equipment financed
under the Lucent facility.

      Interest on loans under the Lucent facility accrues at rates based on the
prime rate or LIBOR, as the borrower under the Lucent facility may elect, plus
an applicable margin. Amounts borrowed under the Lucent facility are to be
repaid in equal quarterly installments beginning on March 31, 2005 and ending on
the maturity of the facility on December 31, 2006. We are to pay an up front
commitment fee equal to a specified percentage of the amount borrowed and an
unused facility fee equal to a percentage of the unused available commitment.


                                       41
<PAGE>

      At any time that outstanding loans under the Lucent facility exceed $500.0
million, Lucent may request that we refinance such loans. If the loans are not
refinanced within a specified period after notice is given, among other
potential adjustments, the interest rate on the outstanding loans will be
increased by a specified percentage per year. Alternatively, after appropriate
notice is given, Lucent and its transferees are entitled under certain
circumstances to convert the loans outstanding under the Lucent facility into
notes of Winstar that will be identical, except for interest rates, to the
senior notes due 2010.

      A portion of the proceeds of certain equity offerings by us are required
to be utilized to repay outstanding indebtedness under the Lucent facility. The
Lucent facility contains customary covenants restricting or limiting our ability
to engage in certain activities, including limitations on debt, liens,
investments, restricted payments, transactions with affiliates, asset sales and
dispositions and changes in corporate existence. At varying times over the term
of the Lucent facility, we are required to meet certain financial, operational
and network build out tests.

Bank facility

      In May 2000, our subsidiary, WCI Capital Corp., entered into a $1.15
billion revolving credit and term loan agreement with a group of commercial
banks and other financial institutions. This Bank facility provides for a $300.0
million revolving credit facility and two term loans aggregating $850.0 million.
We and certain of our subsidiaries are guarantors under the agreement. We have
fully drawn down the available loans under the Bank facility and used the
proceeds to pay all of the outstanding loans under our former facility with
Lucent.

      The Bank facility bears interest at rates based on the prime rate or
LIBOR, as the borrower under the Bank facility may elect, plus applicable
margins. The revolving line of credit will be reduced beginning on December 31,
2004 and is to be fully paid on March 31, 2007. The term loans are to be repaid
in quarterly payments commencing March 31, 2004 and ending on March 31, 2007 in
one instance and on September 30, 2007 in the other instance.

      The amounts drawn under the Bank facility are secured by substantially all
of our current and future assets and certain of our subsidiaries, excluding
assets financed under the Lucent facility described above. The Bank facility
contains covenants similar to those governing the Lucent facility described
above.

2000 notes

      We issued substantially all of our currently outstanding notes in April
and June 2000, as part of a plan of refinancing. The refinancing was comprised
of the new Lucent facility and the Bank facility discussed above and the
following transactions. We undertook the refinancing in order to simplify our
financial structure, provide us with additional capital and increase our
operational and financial flexibility.


                                       42
<PAGE>

      Exchange offer

      We issued approximately $362.2 million principal amount of our 12-3/4%
senior notes due 2010 and approximately $613.9 million principal amount at
maturity ($300.8 million initial principal amount) of our senior discount notes
due 2010 in exchange for:

      o     100.0% of our outstanding 15% senior subordinated deferred interest
            notes due 2007;

      o     96.4% of our outstanding 10% senior subordinated notes due 2008; and

      o     99.9% of our outstanding 11% senior subordinated deferred interest
            notes due 2008.

      Cash tender offer

      We purchased for an aggregate of $753.3 million in cash:

      o     96.4% of our outstanding senior discount notes due 2005;

      o     100.0% of our outstanding senior deferred interest notes due 2005;

      o     99.8% of the outstanding guaranteed senior secured notes due 2004 of
            our subsidiary, Winstar Equipment Corp.; and

      o     100.0% of the outstanding guaranteed senior secured notes due 2004
            of our subsidiary, Winstar Equipment II Corp.

      Private placement

      We also completed a cash offering of $325.0 million aggregate principal
amount of our senior notes due 2008, an additional $168.3 million of our 12-3/4%
senior notes due 2010 and (euro)200 million aggregate principal amount of our
euro-denominated senior notes. The proceeds of this offering, together with
additional cash drawn from available funds, were used to partially fund the cash
tender offer.

      Series C preferred stock exchange

      As part of the refinancing, we entered into agreements with the holders of
98.7% of our then outstanding Series C preferred stock to provide for the
conversion of that stock into our 14-1/4% senior subordinated deferred interest
notes due 2007 and then for the exchange by those


                                       43
<PAGE>

holders of such notes for senior notes due 2010 and senior discount notes due
2010. As a result of these transactions, no shares of Series C preferred stock
remain outstanding, $172.8 million principal amount of the 14-1/4% senior
subordinated deferred interest notes due 2007 was exchanged for $107.2 million
principal amount of senior notes and $313.0 million principal amount at maturity
of senior discount notes and $2.2 million principal amount of the 14-1/4% senior
subordinated deferred interest notes due 2007 remain outstanding.

      Terms of new notes

      Our notes issued in April and June 2000 were issued under indentures
between us and United States Trust Company of New York, as trustee. The
indentures contain the full legal text of the matters described in this section
and other matters. The indentures are subject to and governed by the Trust
Indenture Act of 1939. These notes have identical terms as the notes for which
they are being exchanged, except with respect to certain rights and penalties
relating to registration under the Securities Act.

Other financings

      Equipment lease financings and credit lines

      Our subsidiaries have entered into certain other financing arrangements
and capital leases of equipment, including fiber. As of March 31, 2000, we owed
an aggregate of $306.3 million under these financing arrangements.

      Debt placements

      Between October 1995 and March 1998, we issued various series of notes,
most of which were reacquired and canceled in the cash tender offer and the
exchange offer described above. Such notes that remain outstanding are $8.7
million principal amount at maturity of our 14% senior discount notes due 2005,
$7.2 million principal amount of our 10% senior subordinated notes due 2008,
$323,000 principal amount of 12-1/2% guaranteed senior secured notes due 2004
issued by our subsidiary, Winstar Equipment Corp., and guaranteed by us and
$28,000 principal amount of our 11% senior subordinated deferred interest notes
due 2008. As a result of the consent solicitations made in connection with the
cash tender offer and the exchange offer, the indentures governing these
remaining notes were amended to eliminate most of the restrictive covenants and
certain default provisions.

      There also remain outstanding $2.2 million principal amount of our 14-1/4%
senior subordinated deferred interest notes due 2007 which were not exchanged
for senior notes due 2010 and senior discount notes due 2010 in the Series C
preferred stock exchange transaction. In connection with that transaction, the
indenture governing these notes was amended to eliminate most of the restrictive
covenants and certain default provisions.


                                       44
<PAGE>

Common stock

      Our authorized capital stock includes 200,000,000 shares of common stock,
par value $.01 per share. Our board of directors has approved an increase of
this amount to 400,000,000 shares subject to stockholder approval at a meeting
scheduled for June 28, 2000. The holders of our common stock are entitled to one
vote for each share held of record on all matters submitted to a vote of
stockholders. Although we do not currently intend to pay any cash dividends,
holders of our common stock are entitled to receive dividends as may be declared
by our board of directors. In the event of a liquidation or dissolution, holders
of common stock are entitled to share in all assets remaining after payment of
liabilities and liquidation preference of our preferred stock.

      Holders of our common stock have no preemptive rights. They also have no
rights to convert their common stock into any other securities. There are no
redemption or sinking fund provisions applicable to the common stock. All of the
outstanding shares of common stock are fully paid and nonassessable.

      Our certificate of incorporation:

      o     provides for a board of directors divided into three classes. Each
            class generally serves for a term of three years with only one class
            of directors being elected in each year.

      o     provides that directors may be removed with or without cause.
            Directors may be removed only by an affirmative vote of the holders
            of at least a majority of our capital stock.

      o     requires an affirmative vote of the holders of at least two-thirds
            of our capital stock to alter, amend or repeal the provisions of our
            certificate of incorporation relating to specified matters.

      Nominations for our board of directors may be made by our board or by any
holder of common stock. A stockholder entitled to vote for the election of
directors may nominate a person for election as director only if the stockholder
provides written notice of his intent to make a nomination to our Secretary not
later than sixty days in advance of the meeting. Our certificate of
incorporation and by-laws do not provide for cumulative voting rights. This
means that holders of a majority of our capital stock who vote in the election
of directors can elect all of the directors and, in such event, the holders of
the remaining shares will not be able to elect any of our directors. A special
meeting of our stockholders may be called at the request of the holders of at
least 10% of our outstanding capital stock entitled to vote generally in all
matters.

      Common stock dividend

      In February 2000, we declared a three-for-two stock split, effected in the
form of a 50% common stock dividend. The common stock dividend was distributed
on March 2, 2000 to holders of record as of the close of business on February
16, 2000. The information in this prospectus gives effect to the common stock
dividend.


                                       45
<PAGE>

Preferred stock

      Our certificate of incorporation and the Delaware General Corporation Law
gives our board of directors the authority, without stockholder approval, to
issue up to 15,000,000 shares of preferred stock. Our board of directors has
approved an increase of this amount to 30,000,000 shares, subject to stockholder
approval at a meeting scheduled for June 28, 2000. Our board of directors has
the authority to fix the following terms with respect to shares of any series of
preferred stock:

      o     the designation;

      o     the number of shares;

      o     the dividend rate or rates payable with respect to the shares;

      o     the redemption price or prices, if any, and the terms and conditions
            of any redemption;

      o     the voting rights;

      o     any sinking fund provisions for the redemption or purchase of the
            shares;

      o     the terms and conditions upon which the shares are convertible or
            exchangeable, if they are convertible or exchangeable; and

      o     any other relative rights, preferences and limitations pertaining to
            the series.

      Series A preferred stock

      In February 1997, we sold in a private placement an aggregate of 4,000,000
shares of our Series A preferred stock. Each share of Series A preferred stock
has a stated value of $25. Each share entitles the holder to receive dividends
from us at a rate per year equal to 6% of the stated value. Dividends accrue and
are cumulative from the date of issuance and are payable in arrears on March 31,
June 30, September 30 and December 31 of each year. We may, at our election, pay
dividends in cash or through the issuance of additional shares of Series A
preferred stock.

      The shares of Series A preferred stock are convertible into the number of
shares of our common stock equal to the aggregate stated value of the Series A
preferred stock being converted by $16.67, subject to adjustment. On February
11, 2002, any shares of Series A preferred stock still outstanding will be
automatically converted into shares of our common stock. We may, however, elect
to pay cash instead, in an amount equal to the stated value plus all accrued and
unpaid dividends.

      The Series A preferred stock ranks senior to our common stock and junior
to any other series of our outstanding preferred stock. As of March 31, 2000,
there were approximately 4,471,000 shares of Series A preferred stock
outstanding.


                                       46
<PAGE>

      Series B preferred stock

      We have a rights agreement under which the holders of our common stock
received, as a dividend, preferred stock purchase rights at the rate of one
right for each share of our common stock held as of the close of business on
July 14, 1997. One right will also attach to each share of our common stock
issued after that date. Currently, the rights are not separate from our common
stock and are not exercisable. The rights will only separate from our common
stock and become exercisable if a person or group acquires 10% or more of our
outstanding voting stock, or a person launches a tender or exchange offer that
would result in ownership of 10% or more of our outstanding voting stock.

      Each right that is not owned by an acquiring person entitles the holder to
buy one one-thousandth of one share of our Series B preferred stock. The rights
agreement provides that each right entitles the holder to purchase, for $225,
units of Series B preferred stock with a market value of $450. However, if we
are involved in a business combination in which we are not the surviving entity,
or sell 50% or more of our assets or earning power to another person, then the
rights agreement provides that each right entitles the holder to purchase, for
$225, shares of the common stock of the acquiring person's ultimate parent
having a market value of $450.

      At any time, until ten days following the date on which a person acquires
10% or more of our voting stock, we may redeem all, but not less than all, of
the rights for $0.0001 per right. The rights expire in July 2002. The Series B
preferred stock will have dividend and liquidation preferences over our common
stock, but will be junior to any other series of our preferred stock.

      Series D preferred stock

      On March 17, 1998, we sold an aggregate of $200.0 million of our Series D
preferred stock in a private placement.

      Dividends at the rate of 7% per year on the Series D preferred stock are
cumulative from the date of issuance and are payable quarterly in arrears on
each March 15, June 15, September 15 and December 15 of each year, commencing
September 15, 1998. Dividends shall be payable, at our option, in cash, or
through the issuance of shares of our common stock.

      Holders of the Series D preferred stock have the option to convert their
shares of Series D preferred stock at any time after the issue date into shares
of our common stock at a rate of 1.5119 shares of our common stock for each
share of Series D preferred stock. This is equivalent to a conversion price of
$33.07 for each share of our common stock.

      The Series D preferred stock ranks:

      o     senior to all existing and future capital stock that is junior to
            our Series D preferred stock, including our Series A and Series E
            preferred stock;

      o     equal with our Series F and Series G preferred stock and all future
            capital stock that is specifically designated by our board of
            directors as ranking equally with our Series D preferred stock;


                                       47
<PAGE>

      o     junior to all future capital stock specifically designated by our
            board of directors as being senior to our Series D preferred stock;
            and

      o     junior to all of our indebtedness and that of our subsidiaries.

      The Series D preferred stock is not redeemable prior to March 20, 2001. On
or after that date, the Series D preferred stock will be redeemable at our
option. The Series D preferred stock is subject to mandatory redemption on March
15, 2010, at a redemption price of $50.00 per share, plus accrued and unpaid
dividends, if any. Upon the occurrence of a change in control, as defined in the
certificate of designations governing the Series D preferred stock, we will be
obligated to adjust the conversion price as provided in the certificate of
designations.

      Series E preferred stock

      In connection with an acquisition we consummated in August 1998, we issued
an aggregate of 75,100 shares of our Series E preferred stock. The Series E
preferred stock is non- voting, non-redeemable and does not earn dividends. Each
share of Series E preferred stock has a liquidation preference of $59.93 per
share. The Series E preferred stock is junior in right to receive distributions
in liquidation to all other currently existing preferred stock and any other
class of preferred stock authorized in the future unless such new class is
expressly made junior or equal to the Series E preferred stock. The holders of
the Series E preferred stock may convert their stock into shares of our common
stock at the rate of three shares of common stock for two shares of Series E
preferred stock at any time and we may require them to do so upon the occurrence
of certain conditions.

      Series F preferred stock

      On June 17, 1999, we and a subsidiary of ours sold an aggregate of 300,000
shares of Series F preferred stock for an aggregate purchase price of $300.0
million, less customary discounts and expenses.

      Each share of Series F preferred stock has a liquidation preference of
$1,000 and entitles the holder to receive dividends at an annual rate of 7-1/4%,
or $72.50, per share. Dividends are payable quarterly on March 15, June 15,
September 15 and December 15 of each year to the record holders of the Series F
preferred stock as of the close of business on the business day next preceding
the date of such dividend payment.

      We have the option to pay dividends in either cash or through the issuance
of shares of our common stock. Dividends paid in shares of our common stock will
be calculated by dividing the dollar amount of the dividend by 97% of the
closing bid price of our common stock on Nasdaq on the fourth trading day prior
to the dividend payment date.

      Each share of Series F preferred stock is convertible into shares of our
common stock at a conversion rate of 24.2087 shares for each share of Series F
preferred stock converted, equivalent to a conversion price of $41.31 per share.
We will have the option to convert all of the shares of the Series F preferred
stock into common stock if, on or after June 24, 2002, the closing price of


                                       48
<PAGE>

our common stock on Nasdaq has equaled or exceeded 130% of the conversion price
for at least 20 out of 30 prior consecutive trading days.

      The Series F preferred stock is not redeemable by us prior to June 24,
2002. Thereafter, each share of Series F preferred stock will be redeemable at
certain prices, at our option, in whole or in part, at any time or from time to
time, upon not less than 30 nor more than 60 days' prior notice mailed by
first-class mail to each holder's registered address.

      The Series F preferred stock ranks:

      o     senior to our common stock and our Series A and Series E preferred
            stock;

      o     senior to each class of capital stock which we may create that does
            not expressly rank senior to, or with the same priority as, our
            Series F preferred stock;

      o     equal with our Series D and Series G preferred stock;

      o     equal with each class of capital stock which we may create that
            expressly provides that it ranks equally with our Series F preferred
            stock; and

      o     junior to each class of capital stock which we may create that
            expressly provides that it ranks senior to our Series F preferred
            stock.

      We may not create or increase the amount of any class or series of capital
stock that ranks senior to the Series F preferred stock without the consent of
the holders of at least 66-2/3% of the Series F preferred stock. However, we may
create or increase the amount of any class of stock that ranks with the same
priority as, or junior to, the Series F preferred stock.

      Series G preferred stock

      On February 1, 2000, we and one of our wholly-owned subsidiaries, Winstar
Credit Corp., sold an aggregate of 900,000 shares of our Series G preferred
stock in a private placement for an aggregate purchase price of $900.0 million.
The shares were purchased by Credit Suisse First Boston Equity Partners, L.P.,
Welsh, Carson, Anderson & Stowe VIII, L.P., Microsoft and certain other
purchasers.

      The Series G preferred stock, which votes on an as-converted basis with
our common stock, currently represents ownership of approximately 19.3% of our
outstanding common shares, 18.1% of our outstanding voting shares, and
approximately 13.0% of our fully diluted common shares on a pro forma basis as
of December 31, 1999.

      If any cash dividends are paid on our common stock, the holders of our
Series G preferred stock will be entitled to receive such cash dividends on an
as-converted basis. In addition, the Series G preferred stock pays cumulative
dividends at a rate equal to the excess, if any, of 5.75% per year on its
liquidation preference over the amount of any regular cash dividends per share
of Series G preferred stock that have been paid during the applicable dividend
period on our common stock.


                                       49
<PAGE>

      Such dividends will be payable quarterly in arrears on each March 15, June
15, September 15 and December 15 of each year to the record holders of the
Series G preferred stock as of each March 1, June 1, September 1 and December 1.
If we do not pay such dividends in cash, the amount of such dividends will be
added to the liquidation preference of the Series G preferred stock.

      Each share of Series G preferred stock is convertible, at the option of
the holder, into shares of our common stock at a conversion price of $45.00 per
share, subject to certain adjustments. We will have the option to convert all of
the shares of Series G preferred stock into common stock at the conversion price
if, on any date after the third anniversary of the date of issuance of the
Series G preferred stock, the volume-weighted average trading price of our
common stock on Nasdaq for the 20 consecutive trading days immediately prior to
such date is at least equal to 155% of the conversion price on such date.

      In the event of any voluntary or involuntary liquidation, dissolution or
winding up of our operations before any payment or distribution of our assets
are made to the holders of any securities ranking junior to the Series G
preferred stock, holders of Series G preferred stock will be entitled to receive
an amount per share equal to the greater of:

      o     the accreted value of the Series G preferred stock on such date,
            plus all dividends accrued to such date, whether or not earned or
            declared, since the end of the previous dividend period; and

      o     the amount that would have been payable on the number of shares of
            common stock into which a share of Series G preferred stock was
            convertible immediately prior to such date.

Holders of Series G preferred stock will not be entitled to any further payment.
If our assets that are distributable among the holders of Series G preferred
stock are insufficient to pay in full the preferential amount and liquidating
payments on any securities ranking equally with the Series G preferred stock,
then such assets will be distributed among the holders of Series G preferred
stock and any such equally ranked securities ratably in accordance with the
respective amounts that would be payable if all amounts payable thereon were
paid in full.

      With respect to dividend rights and rights on liquidation, dissolution and
winding up, the Series G preferred stock ranks:

      o     senior to our common stock and our Series A and Series E preferred
            stock;

      o     senior to each class of capital stock which we may create that does
            not expressly rank senior to, or equally with, our Series G
            preferred stock;

      o     equal with our Series D and Series F preferred stock;

      o     equal with each class of capital stock which we may create that
            expressly provides that it ranks equally with our Series G preferred
            stock; and


                                       50
<PAGE>

      o     junior to each class of capital stock that we may create that
            expressly provides that it ranks senior to our Series G preferred
            stock.

      We may not issue any securities that are senior to the Series G preferred
stock without the consent of the holders of a majority of the outstanding Series
G preferred stock.

      On April 1, 2010, we will be required to redeem all of the outstanding
shares of Series G preferred stock. The redemption price per share will be equal
to the greater of the accreted value of the Series G preferred stock on such
date, plus all dividends accrued to such date whether or not earned or declared,
since the most recent dividend payment date and the volume-weighted average
trading price per share of our common stock on Nasdaq for the 20 consecutive
trading days immediately prior to April 1, 2010 multiplied by the number of
shares of common stock into which the Series G preferred stock is convertible on
such date. We have the option to pay the redemption price in cash or in shares
of common stock. If we elect to pay the redemption price, in whole or in part,
in shares of common stock, such shares will be valued at 97% of the
volume-weighted average trading price per share of our common stock on Nasdaq
for the 20 consecutive trading days immediately prior to April 1, 2010. If we
elect to pay the redemption price in shares of common stock, we have agreed to
use our best efforts to register such shares under the Securities Act of 1933
prior to the delivery of such shares.

      In the event of a change of control of Winstar, we will make an offer to
purchase all outstanding shares of Series G preferred stock at a purchase price
ranging from 102% to 105% of the accreted value per share on such date, plus all
dividends accrued to such date, whether or not earned or declared, since the end
of the previous dividend period. We have the option to pay the change of control
amount in cash or shares of common stock. If we elect to pay the applicable
change of control amount in shares of common stock, such shares will be valued
at the volume- weighted average trading price per share of our common stock on
Nasdaq for the 20 consecutive trading days immediately prior to the date the
change of control amount is paid. We have agreed to use our best efforts to
register such shares prior to the delivery of such shares.

      Each holder of Series G preferred stock will be entitled to vote on all
matters and will be entitled to that number of votes equal to the number of
shares of common stock into which such holder's shares of Series G preferred
stock could be converted on the record date for the determination of
stockholders entitled to vote on such matter or, if no such record date is
established, on the date such vote is taken or any written consent of
shareholders is solicited. In addition, so long as any of the Series G preferred
stock is outstanding, the affirmative vote of the holders of a majority of the
outstanding shares of Series G preferred stock, voting together as a single
class, will be necessary to:

      o     amend, alter or repeal any provision of our certificate of
            incorporation or by-laws so as to adversely affect the Series G
            preferred stock;

      o     issue any additional Series G preferred stock or create, authorize
            or issue any capital stock that ranks senior, whether with respect
            to dividends or upon liquidation, dissolution, winding up or
            otherwise, to the Series G preferred stock; or


                                       51
<PAGE>

      o     redeem for cash any junior securities, subject to certain
            exemptions.

Registrar and transfer agent

      Continental Stock Transfer & Trust Company is the registrar and transfer
agent for our common stock and our Series A, Series D and Series F preferred
stock. Continental is located at 2 Broadway, New York, New York 10004.

             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS

      The following is a summary of certain U.S. Federal income tax consequences
associated with the ownership and disposition of the exchange notes.

      This discussion deals only with exchange notes held as capital assets
within the meaning of section 1221 of the Internal Revenue Code of 1986, as
amended, and does not deal with special situations, such as those of dealers in
securities or currencies, traders in securities that elect to mark to market,
financial institutions, life insurance companies, tax-exempt organizations,
persons that hold the notes as a hedge or part of a straddle or conversion
transaction, or that have a functional currency other than the U.S. dollar, and
investors in pass-through entities. It does not describe any tax consequences
arising out of the tax laws of any state, local or foreign jurisdiction. This
discussion is based upon the provisions of the Code, and regulations, rulings
and judicial decisions under the Code as of the date of this filing. At any time
and without prior notice, these authorities may be repealed, revoked or modified
so as to result in Federal income tax consequences different from those
discussed below.

      For purposes of this discussion, a U.S. holder is:

      o     a citizen or resident of the United States;

      o     a corporation or other entity taxable as a corporation created or
            organized in or under the laws of the United States or any political
            subdivision thereof;

      o     an estate the income of which is subject to United States Federal
            income taxation regardless of its source; or

      o     a trust, if a U.S. court can exercise primary supervision over the
            administration of the trust and one or more U.S. persons have the
            authority to control all substantial decisions of the trust.

      The term "Non-U.S. holder" means any person other than a U.S. holder. If
an entity treated as a partnership for U.S. Federal income tax purposes owns an
exchange note, the tax treatment of a partner would generally depend upon the
status of the partner and upon the activities of the partnership. Partners of
partnerships owning exchange notes should consult their tax advisors.


                                       52
<PAGE>

      You should consult your tax advisor concerning the application of U.S.
Federal income tax laws, as well as the laws of any state, local or foreign
taxing jurisdiction, to your particular situation.

Euro notes and euro exchange notes

      Except with respect to the discussion of backup withholding below, the
discussion with respect to euro notes and euro exchange notes is limited to tax
considerations applicable to a holder which is a "U.S. holder."

      Exchange offer. The exchange of outstanding euro notes for euro exchange
notes pursuant to the exchange offer should not be a taxable exchange.
Consequently, a U.S. holder should not recognize taxable income or loss as a
result of exchanging an outstanding euro note for a euro exchange note pursuant
to the exchange offer. The holding period of a euro exchange note will include
the holding period of the outstanding euro note and the basis of the euro
exchange note will be the same as the basis of the outstanding euro note
immediately before the exchange.

      Payment of interest. Interest on the euro exchange notes will be taxable
to a U.S. holder as ordinary interest income in accordance with the U.S.
holder's method of tax accounting. Such interest will generally be U.S. source
income for purposes of computing the foreign tax credit limitation.

      The euro exchange notes will be denominated in a currency unit other than
the U.S. dollar, i.e., in euro (sometimes referred to as the "foreign
currency"). Accordingly, any interest income will be determined in euros and
will be translated into U.S. dollars as follows:

      o     if the U.S. holder uses the cash method of accounting, the interest
            income will be translated at the exchange rate in effect on the date
            of receipt of the interest payment;

      o     if the U.S. holder uses the accrual method of accounting, the U.S.
            dollar value of the accrued interest income will be determined by
            translating such income at the average rate of exchange for the
            accrual period, or with respect to an accrual period that spans two
            taxable years, at the average rate for the partial period within the
            taxable year; and

      o     if the U.S. holder uses the accrual method of accounting, it can
            elect to translate the accrued interest income using the rate of
            exchange on the last day of the accrual period or, with respect to
            an accrual period that spans two taxable years, using the rate of
            exchange on the last day of the taxable year. If the last day of an
            accrual period is within five business days of the receipt of the
            accrued income, a U.S. holder may translate such income using the
            rate of exchange on the date of receipt of the interest income. This
            election will apply to other debt obligations held by the U.S.
            holder and may not be changed without the consent of the Internal
            Revenue Service.


                                       53
<PAGE>

      A U.S. holder that uses the accrual method of accounting may recognize
exchange gain or loss (which will be treated as ordinary income or loss)
attributable to fluctuations in exchange rates with respect to accrued interest
income on the date such income is received. The amount of ordinary income or
loss recognized will equal the difference, if any, between:

      o     the U.S. dollar value of the euro payment received (determined on
            the date such payment is received) in respect of such accrual
            period; and

      o     the U.S. dollar value of income that has accrued during such accrual
            period (as determined above).

      A U.S. holder on the cash basis method of accounting will not recognize
exchange gain or loss with respect to the receipt of interest income.

      Sale, exchange or retirement of euro exchange notes. Upon the sale,
exchange or retirement of euro exchange notes, a U.S. holder will generally
recognize gain or loss equal to the difference between:

      o     the amount realized upon the disposition (as determined below),
            other than amounts attributable to accrued interest; and

      o     the U.S. holder's adjusted tax basis in the euro exchange notes (as
            determined below).

      Except with respect to any foreign currency gain or loss (as described
below), such gain or loss will be capital gain or loss. The deductibility of
capital losses is subject to limitations.

      The amount realized by a U.S. holder that receives foreign currency
(including euros) on a sale, exchange (other than pursuant to an exchange
offer), retirement or other disposition of a euro exchange note will be based
on:

      o     the U.S. dollar value of the foreign currency on the date of
            disposition in the case of an accrual basis U.S. holder;

      o     the U.S. dollar value of the foreign currency on the date payment is
            received in the case of a cash basis U.S. holder; or

      o     the U.S. dollar value of the foreign currency on the date of
            settlement if the euro exchange notes are traded on an established
            securities market and the holder is a cash basis U.S. holder. An
            accrual basis U.S. holder may elect the same treatment required of
            cash basis taxpayers with respect to purchases and sales of publicly
            traded notes, provided the election is applied consistently. Any
            such election cannot be changed without the consent of the IRS.

      A U.S. holder's adjusted tax basis in a euro exchange note will equal the
U.S. dollar cost of the outstanding euro note (determined on the date of
purchase) to such U.S. holder. If a U.S. holder purchased an outstanding euro
note with previously owned foreign currency, the U.S.


                                       54
<PAGE>

holder will recognize ordinary income or loss in an amount equal to the
difference, if any, between such U.S. holder's tax basis in the foreign currency
and the U.S. dollar fair market value of the foreign currency used to purchase
the outstanding euro note, determined on the date of purchase.

      Foreign currency gain or loss upon sale, exchange or retirement of euro
exchange notes. Upon the sale, exchange or retirement of euro exchange notes, a
U.S. holder may recognize foreign currency gain or loss attributable to
fluctuation in currency exchange rates equal to the difference between:

      o     the U.S. dollar value of the principal amount of the euro exchange
            note, determined on the date of such sale, exchange or retirement
            (determined on a cash or accrual basis as described above); and

      o     the U.S. dollar value of the principal amount of such note,
            determined on the date the U.S. holder acquired the outstanding euro
            note.

      For this purpose, the principal amount of a euro exchange note is the U.S.
holder's purchase or acquisition cost of the outstanding euro note in euros.
Such foreign currency gain or loss will be taxable as ordinary income or loss
and will not be treated as interest income or expense. Such foreign currency
gain or loss will be recognized only to the extent of the total gain or loss
realized by the U.S. holder on the sale, exchange or retirement of the euro
exchange note.

      U.S. information reporting and backup withholding. Under the Internal
Revenue Code, a holder of euro exchange notes may be subject, under certain
circumstances, to "backup withholding" at a 31% rate with respect to interest
payments thereon or the gross proceeds thereof. This withholding generally
applies only if the holder:

      o     in the case of a U.S. holder, fails to furnish a correct social
            security or other taxpayer identification number within a reasonable
            time after the request therefor; or

      o     in the case of a non-U.S. holder, fails to furnish proper
            certification of foreign status.

      Any amount withheld from a payment to a holder under backup withholding
rules will be refunded or allowed as a credit against such holder's U.S. federal
income tax liability, provided that the required information is furnished to the
U.S. Internal Revenue Service. Holders of euro exchange notes should consult
their tax advisors as to their qualification for exemption from backup
withholding and the procedure for obtaining such an exemption.


                                       55
<PAGE>

Senior exchange notes due 2008, senior exchange notes due 2010 and senior
discount exchange notes due 2010

      Tax considerations for U.S. holders

      Exchange offer. The exchange of outstanding senior notes due 2008, senior
notes due 2010 and senior discount notes due 2010 for exchange notes in the
exchange offer should not be a taxable exchange. Consequently, a U.S. holder
should not recognize taxable income or loss as a result of exchanging an
outstanding senior note or an outstanding senior discount note for an exchange
note in the exchange offer. The holding period of an exchange note will include
the holding period of the outstanding notes and the basis of the exchange note
will be the same as the basis of the outstanding notes immediately before the
exchange.

       Taxation of interest on senior exchange notes. A U.S. holder of a senior
exchange note due 2008 or a senior exchange note 2010 will be required to
include interest payable on such note as ordinary income at the time the
interest is received or accrues, in accordance with the holder's regular method
of tax accounting.

      Characterization of the senior discount exchange notes due 2010. We intend
to treat the senior discount exchange notes due 2010 as debt for U.S. Federal
income tax purposes. However, it is possible that the Internal Revenue Service
will contend that the senior discount exchange notes due 2010 should be treated
as an equity interest in, rather than debt of, Winstar, in which case the tax
consequences to holders owning the senior discount exchange notes due 2010 will
be different from those described herein. Holders are urged to consult their own
tax advisors with respect to the possibility that the senior discount exchange
notes due 2010 will be determined to be equity rather than debt, and the
potential consequences of any such determination. The remainder of this summary
assumes that the senior discount exchange notes due 2010 will constitute debt of
Winstar for such tax purposes.

      Original issue discount on the senior discount exchange notes due 2010.
Because the "issue price" of the outstanding senior discount notes due 2010 was
less than their "stated redemption price at maturity," the senior discount
exchange notes due 2010 will be treated as issued with OID, and each holder will
be required to include in income (regardless of whether such holder is a cash or
accrual basis taxpayer) in each taxable year, in advance of the receipt of
corresponding cash payments on such notes, that portion of the OID, computed on
a constant yield basis as described below, attributable to each day during such
year on which the holder held the notes. The amount of OID with respect to each
senior discount exchange note is $1,247.60 per $1,000 principal amount of each
senior discount exchange note. This amount of OID was equal to the excess of (i)
$1,737.50, its "stated redemption price at maturity" over (ii) $489.90, its
issue price. Under applicable Treasury Regulations, the stated redemption price
at maturity of each senior discount exchange note includes all payments to be
made in respect thereof, including payments of the principal amount and any
stated interest payments other than payments of "qualified stated interest."
Payments of qualified stated interest are payments of interest which are
unconditionally payable in cash or property (other than debt instruments of the
issuer) at least


                                       56
<PAGE>

annually at a qualifying rate, including a single fixed rate over the entire
term of a discount note. The stated interest on the senior discount exchange
notes due 2010 will not qualify as "qualified stated interest", and thus the
"stated redemption price at maturity" of the senior discount exchange notes due
2010 includes all cash payments of principal and interest through maturity. The
"issue price" of the notes was the first price at which a substantial portion
was sold to investors (excluding bond houses, brokers, or similar persons acting
as underwriters, placement agents, or wholesalers) for cash.

      A holder of a debt instrument issued with OID and that does not pay
qualified stated interest generally is required to include in gross income for
U.S. Federal income tax purposes an amount equal to the sum of the "daily
portions" of such OID for all days during the taxable year on which the holder
holds the debt instrument. The daily portions of OID required to be included in
a holder's gross income in a taxable year will be determined upon a
constant-yield basis by allocating to each day during the taxable year on which
the holder holds the debt instrument a pro-rata portion of the OID on such debt
instrument which is attributable to the "accrual period" in which such day is
included. An accrual period with respect to a senior discount exchange note may
be any length and may vary in length over the term of the senior discount
exchange note as long as (i) no accrual period is longer than one year and (ii)
each scheduled payment of interest or principal on the senior discount exchange
note occurs on either the final or first day of an accrual period. The amount of
the OID attributable to any "accrual period" will be an amount equal to the
product of the "adjusted issue price" of the senior discount exchange note at
the beginning of such accrual period and the "yield to maturity" of the debt
instrument (stated in a manner appropriately taking into account the length of
the accrual period). The "yield to maturity" is the discount rate that, when
used in computing the present value of all payments to be made under the notes,
produces an amount equal to the issue price of the notes. The "adjusted issue
price" of a debt instrument at the beginning of an accrual period is defined
generally as the issue price of a debt instrument plus the aggregate amount of
OID that accrued in all prior accrual periods, less any cash payments on the
debt instrument. The yield to maturity on the senior discount exchange note
compounded semiannually on April 15 and October 15 is 14.75%. Accordingly, a
holder of a senior discount exchange note will be required to include OID in
gross income for U.S. Federal income tax purposes in advance of the receipt of
cash in respect of such income. In general, payments on a senior discount
exchange note issued with OID, will be treated first as a payment of accrued but
previously unpaid OID, to the extent thereof, and then as payment of principal.
A holder's tax basis in the notes will be increased by any amounts of OID
included in income by such holder, and will be decreased by any payments
received by such holder with respect to the notes. The amount of OID allocable
to an initial short accrual period may be computed using any reasonable method
if all other accrual periods, other than a final short accrual period, are of
equal length. The amount of OID allocable to the final accrual period at
maturity of the outstanding senior discount note will be the difference between
(i) the amount payable at maturity of the note, and (ii) the note's adjusted
issue price as of the beginning of the final accrual period.

      The senior exchange notes due 2008 and the senior exchange notes due 2010
are not being issued with original issue discount because stated interest is
unconditionally payable in cash semi-annually throughout the life of the
instrument.

      Applicable high yield discount obligations. As the yield to maturity on
the senior discount exchange notes due 2010 equals or exceeds the sum of (x) the
AFR (as determined


                                       57
<PAGE>

under Section 1274(d) of the Internal Revenue Code) in effect for the month in
which the outstanding senior discount notes due 2010 were issued and (y) five
percent, and the OID on the notes is "significant," the senior discount exchange
notes due 2010 will be considered "applicable high yield discount obligations"
("AHYDOs"). (The applicable AFR for the month of March 2000 is 6.64%.) A debt
instrument generally has "significant" OID if, as of the close of any accrual
period ending more than five years after the date of issue, the excess of the
interest (including OID) that has accrued on the obligation over the interest
(including OID) that is required to be paid thereunder exceeds the product of
the issue price of the instrument and its yield to maturity. As the senior
discount exchange notes due 2010 are AHYDOs, we will not be entitled to a
deduction for OID accrued on such notes for U.S. federal income tax purposes
until such time as we actually pay the accrued OID. In addition, as the yield to
maturity on the senior discount exchange notes due 2010 exceeds the sum of (x)
the AFR and (y) six percent (such excess referred to as the "disqualified
yield"), the deduction for OID accrued on the senior discount exchange notes due
2010 will be permanently disallowed to the extent such OID is attributable to
disqualified yield on the notes ("dividend-equivalent interest"). Solely for
purposes of the dividends-received deduction (and not for purposes of
determining the amount includible in income), such dividend-equivalent interest
will be treated as a dividend to the extent it is deemed to have been paid out
of our current or accumulated earnings and profits, if any. We believe that we
do not presently have any current or accumulated earnings and profits and we
cannot predict whether we will have any earnings and profits for future years.
As such, in any year in which we have no earnings and profits, the nondeductible
portion of such OID relating to such year would not be eligible for the
dividends-received deduction in the case of corporate holders.

      Acquisition premium on senior discount exchange notes due 2010. If a U.S.
holder acquired an outstanding senior discount note at a cost in excess of its
"adjusted issue price" (as defined above) but less than its stated redemption
price at maturity, the senior discount exchange note will have an acquisition
premium to the extent of such excess. Under the acquisition premium rules of the
Code and the Treasury Regulations promulgated thereunder, the amount of the
original issue discount which such U.S. holder must include in its gross income
with respect to such senior discount exchange note for any taxable year will be
reduced by the portion of such acquisition premium properly allocable to such
year.

      Market discount. If a U.S. holder purchased an outstanding note for an
amount that is less than the "revised issue price" of the notes at the time of
acquisition, the amount of such difference will be treated as "market discount"
for U.S. federal income tax purposes, unless such difference is less than a
specified de minimis amount ("de minimis market discount"). The "revised issue
price" is the original issue price of the note plus the aggregate amount of
previously accrued original issue discount (in the case of a senior discount
exchange note), without regard to any reductions for acquisition premium, less
payments other than qualified stated interest. Under the market discount rules,
a holder will be required to treat any principal payment on or any gain on the
sale, exchange, retirement or other disposition of, notes as ordinary income to
the extent of the market discount which has not previously been included in
income and is treated as having accrued on such notes at the time of such
payment or disposition. If a holder makes a gift of a note, accrued market
discount, if any, will be recognized as if such holder had sold such note for a
price equal to its fair market value. In addition, the holder may be required to
defer, until the maturity of the notes or the earlier disposition of the notes
in a taxable transaction, the deduction


                                       58
<PAGE>

of a portion of the interest expense on any indebtedness incurred or continued
to purchase or carry such notes.

      Any market discount will be considered to accrue on a straight-line basis
during the period from the date of acquisition to the maturity date of the
notes, unless a holder elects to accrue market discount on a constant interest
method. A holder of notes may elect to include market discount in income
currently as it accrues (on either a straight-line basis or constant interest
method), in which the case rules described above regarding the deferral of
interest deductions and ordinary income treatment of gain on disposition will
not apply. This election to include market discount in income currently, once
made, applies to all market discount obligations acquired on or after the first
day of the first taxable year to which the election applies and may not be
revoked without the consent of the Internal Revenue Service.

      Amortized bond premium on senior exchange notes due 2008 and 2010.
Generally, if the tax basis of a senior exchange note due 2008 or a senior
exchange note due 2010 (generally, the purchase price of the outstanding note
delivered in exchange therefore) held as a capital asset exceeds the amount
payable at maturity of the obligation, such excess will constitute amortizable
bond premium that the holder may elect, under Section 171 of the Code, to
amortize under the constant yield method over the period from its acquisition
date to the obligation's maturity date. A holder of a senior exchange note due
2008 or senior exchange note due 2010 who elects to amortize bond premium must
reduce its tax basis in the related senior exchange note by the amount of the
aggregate amortization allowable for amortizable bond premium. Amortizable bond
premium will be treated under the Internal Revenue Code as an offset to interest
income on the senior exchange note due 2008 or a senior exchange note due 2010
for U.S. federal income tax purposes. An election to amortize bond premium on a
senior exchange note due 2008 or a senior exchange note due 2010 generally
applies to all bonds held by the holder at the beginning of the first taxable
year to which the election applies or thereafter acquired, and may not be
revoked without the consent of the Internal Revenue Service.

      Elections. A U.S. holder of exchange notes, subject to certain
limitations, may elect to include all stated and unstated interest and discount
on the notes in gross income under the constant yield method. For this purpose,
interest includes original issue discount, de minimis market discount and market
discount, as adjusted by any amortizable bond premium or acquisition premium.
Any such election, if made in respect of a market discount bond, will constitute
an election to include market discount in income currently on all market
discount bonds acquired by such U.S. holder on or after the first day of the
first taxable year to which the election applies. See "-- Market Discount." U.S.
holders should consult with their tax advisors regarding any tax elections they
intend to make with respect to any exchange notes.

      Optional redemptions. We may redeem the senior discount exchange notes due
2010, in whole or in part, at certain times and under certain circumstances
described elsewhere herein. The Treasury Regulations issued under the provisions
of the Internal Revenue Code relating to OID contain rules for determining the
yield and maturity of debt instruments that are subject to certain options or
other contingent payments. Pursuant to those regulations, we believe that
neither we nor any holders of senior discount exchange notes due 2010 should be
deemed to exercise any of the options described in this registration statement,
and thus, the existence of these options should


                                       59
<PAGE>

not affect the calculation of the yield and maturity of the senior discount
exchange notes due 2010.

      Sale or other disposition. In general, upon the sale, exchange or other
disposition (including a redemption) of an exchange note, a U.S. holder will
recognize taxable gain or loss equal to the difference between (i) the amount of
cash proceeds and the fair market value of any property received (other than any
amount representing accrued but unpaid qualified stated interest or OID, which
will be taxable as ordinary income), and (ii) the holder's adjusted tax basis in
the exchange note.

      Except with respect to accrued market discount on the exchange notes, if
any, as described above, gain or loss realized on the sale, exchange or other
disposition of an exchange note will be capital gain or loss, and will be
long-term capital gain or loss if the exchange note is held for more than one
year, or short-term capital gain or loss if the exchange note is held for one
year or less.

      Tax considerations for Non-U.S. holders

      Payments of Interest. Interest that we pay on the senior exchange note due
2008 or a senior exchange note due 2010 and payments of OID we make on the
senior discount exchange notes due 2010 to a beneficial owner of an exchange
note that is a Non-U.S. holder will qualify for the "portfolio interest"
exemption and therefore will not be subject to U.S. federal income or
withholding tax if such interest or OID is not effectively connected with the
conduct of a trade or business within the United States by such Non-U.S. holder
and, among other things, (i) such Non- U.S. holder does not own, actually or
constructively, 10% or more of the total combined voting power of all classes of
our stock entitled to vote, within the meaning of Section 871(h)(3) of the
Internal Revenue Code, (ii) such Non-U.S. holder is not a controlled foreign
corporation that is related, directly or indirectly, to Winstar through stock
ownership, (iii) such Non-U.S. Holder is not a bank receiving interest described
in Section 881(c)(3)(A) of the Internal Revenue Code, and (iv) the certification
requirements under Section 871(h) or Section 881(c) of the Internal Revenue Code
and the Treasury Regulations thereunder (summarized below) are satisfied.

      Interest or OID on an exchange note that is not effectively connected with
the Non-U.S. holder's conduct of a trade or business within the United States
and does not qualify as portfolio interest, would generally be subject to United
States withholding tax at a flat rate of 30% (or a lower applicable treaty
rate). If interest or OID received by a Non-U.S. holder is effectively connected
with the conduct of a trade or business within the United States, then the
Non-U.S. holder will be subject to U.S. Federal income tax on such interest
income in essentially the same manner as a U.S. holder and, in the case of a
Non-U.S. holder that is a foreign corporation, may also be subject to the branch
profits tax.

      Sale, exchange, or disposition. A Non-U.S. holder generally will not be
subject to U.S. federal income tax with respect to gain realized on a sale,
redemption or other disposition of an exchange note (other than amounts
attributable to accrued but unpaid OID on the senior discount exchange notes due
2010, which may be subject to the rules regarding OID described above) unless
(i) the gain is effectively connected with the conduct of a trade or business
within the United States by the Non-U.S. holder or, if certain tax treaties
apply, is attributable to a U.S.


                                       60
<PAGE>

permanent establishment maintained by the Non-U.S. holder, (ii) in the case of a
Non-U.S. holder who is a nonresident alien individual, such holder is present in
the United States for 183 or more days in the taxable year and certain other
requirements are met, or (iii) the Non-U.S. Holder is subject to Internal
Revenue Code provisions applicable to certain U.S. expatriates.

      Certification requirements. To satisfy the certification requirements
noted above, (i) the beneficial owner of an exchange note must certify, under
penalties of perjury, to us or our paying agent that the owner is a Non-U.S.
holder and must provide the owner's name and address, and U.S. taxpayer
identification number ("TIN"), if any, which certification may be made on IRS
Form W-8BEN, or (ii) a securities clearing organization, bank or other financial
institution that holds customer securities in the ordinary course of its trade
or business (a "Financial Institution") and holds the exchange note on behalf of
the beneficial owner must certify, under penalties of perjury, to us or our
paying agent that such certificate has been received from the beneficial owner
and must furnish the payor with a copy thereof.

      For payments made after December 31, 2000, in the case of exchange notes
held by a foreign partnership that is not a withholding foreign partnership, the
partnership, in addition to providing an IRS Form W-8IMY, must attach an IRS
Form W-8BEN received from each partner.

      If a Non-U.S. holder of an exchange note is engaged in a trade or business
in the U.S., and if interest, including OID, on the senior discount exchange
note, or gain realized on the sale, exchange or other disposition of the
exchange note is effectively connected with the conduct of the trade or business
(or, if a tax treaty applies, is attributable to a U.S. permanent establishment
maintained by the Non-U.S. holder), the Non-U.S. holder, although exempt from
U.S. federal withholding tax (provided that certification requirements are met),
will generally be subject to regular U.S. federal income tax on the interest,
including OID, or gain in the same manner as if it were a U.S. holder. In lieu
of the certificate described above (with respect to non-effectively connected
interest), the Non-U.S. holder will be required to provide us or our paying
agent with a properly executed IRS Form 4224 (or, after December 31, 2000, a
Form W-8ECI) in order to claim an exemption from withholding tax. In addition,
if the Non-U.S. holder is a foreign corporation, it may be subject to a branch
profits tax equal to 30% (or such lower rate provided by an applicable treaty)
on its effectively connected earnings and profits for the taxable year, subject
to certain adjustments.

      Non-U.S. holders should consult with their tax advisors regarding U.S. and
foreign tax consequences with respect to the ownership and disposition of
exchange notes.

Backup withholding and information reporting

      Backup withholding at a rate of 31% may apply to payments made in respect
of, and gross proceeds from the sale, exchange or disposition of, an exchange
note to a holder who is not an "exempt recipient" and who fails to provide
certain identifying information (such as the holder's TIN) in the manner
required. Generally, individuals are not exempt recipients, whereas corporations
and certain other entities are exempt recipients. Payments made in respect of an
exchange note must be reported to the Internal Revenue Service, unless the
holder is an exempt recipient or otherwise establishes an exemption.


                                       61
<PAGE>

      In the case of payments to a Non-U.S. holder of interest on an exchange
note, backup withholding and information reporting will not apply if the
Non-U.S. holder furnishes a certificate of foreign status on IRS Form W-8BEN,
W-8ECI or W-8IMY or otherwise establishes an exemption (provided that neither we
nor our paying agent has actual knowledge, or after December 31, 2000, reason to
know, that the holder is a U.S. holder or that the conditions of any other
exemption are not in fact satisfied).

      In general, backup withholding and information reporting will not apply to
a payment of the gross proceeds of a sale of exchange notes effected at a
foreign office of a broker. However, payments of the proceeds of a sale of an
exchange note to or through a foreign office of a broker that is (i) a U.S.
person, (ii) a controlled foreign corporation, (iii) a foreign person 50% or
more of whose gross income from all sources for the three-year period ending
with the close of its taxable year preceding the payment was effectively
connected with the conduct of a trade or business within the U.S. or (iv) with
respect to payments made after December 31, 2000, a foreign partnership with
certain connections to the U.S., are currently subject to certain information
reporting requirements, but not back-up withholding, unless the payee is an
exempt recipient or the broker has evidence in its records that the payee is a
Non-U.S. holder and no actual knowledge or, after December 31, 2000, reason to
know that such evidence is false and certain other conditions are met. Payments
of the proceeds of a sale of an exchange note to or through the U.S. office of a
broker will be subject to information reporting and backup withholding unless
the payee certifies under penalties of perjury as to his or her status as a
Non-U.S. holder and satisfies certain other qualifications (and no agent or
broker who is responsible for receiving or reviewing such statement has actual
knowledge or, after December 31, 2000, reason to know that it is incorrect) and
provides his or her name and address or the payee otherwise establishes an
exemption.

      Non-U.S. holders should consult their tax advisors regarding the
application of information reporting and backup withholding in their particular
situations the availability of an exemption therefrom, and the procedure for
obtaining such an exemption, if available. Backup withholding is not an
additional tax. Any amounts withheld under the backup withholding rules from a
payment to a holder of an exchange note will be allowed as a refund or credit
against the holder's U.S. Federal income tax, if the required information is
furnished to the Internal Revenue Service.

      THE FOREGOING SUMMARY IS INCLUDED HEREIN FOR GENERAL INFORMATION ONLY AND
DOES NOT DISCUSS ALL ASPECTS OF UNITED STATES FEDERAL INCOME TAXATION THAT MAY
BE RELEVANT TO A PARTICULAR HOLDER OF EXCHANGE NOTES IN LIGHT OF ITS PARTICULAR
CIRCUMSTANCES AND INCOME TAX SITUATION. ACCORDINGLY, EACH HOLDER OF THE EXCHANGE
NOTES SHOULD CONSULT WITH ITS OWN TAX ADVISOR AS TO THE SPECIFIC TAX
CONSEQUENCES TO SUCH HOLDER FROM THE EXCHANGE OF OUTSTANDING NOTES AND OWNERSHIP
AND DISPOSITION OF THE EXCHANGE NOTES, INCLUDING THE APPLICATION AND EFFECT OF
STATE, LOCAL AND FOREIGN INCOME AND OTHER TAX LAWS.


                                       62
<PAGE>

                      CERTAIN LUXEMBOURG TAX CONSIDERATIONS
                             FOR EURO EXCHANGE NOTES

      The information set out below is a summary only of Luxembourg tax laws in
effect on the date hereof and which may change from time to time. Because the
summary does not address all tax considerations, under Luxembourg or other laws,
prospective investors should consult their professional advisors as to the tax
consequences of the exchange, ownership and disposition of the euro exchange
notes, including in particular the effect of tax laws of any other jurisdiction.

      The following summary outlines certain Luxembourg tax consequences for
holders of euro exchange notes.

      Participation in the exchange offer should not give rise to recognition of
any gain or income for Luxembourg tax purposes.

      Under Luxembourg tax laws currently in effect, there is no withholding tax
on payment of principal, interest, nor on accrued but unpaid interest in respect
of the euro exchange notes, nor is any Luxembourg withholding tax payable upon
the redemption, repurchase or exchange of the euro exchange notes. Holders of
euro exchange notes who are non-residents of Luxembourg and who do not hold euro
exchange notes through a permanent establishment in Luxembourg are not liable
for Luxembourg income tax on payments of principal, interest, or accrued but
unpaid interest, nor upon redemption, repurchase or exchange of the euro
exchange notes, nor on capital gains on sale of any euro exchange notes.

      Holders of euro exchange notes resident in Luxembourg who are fully
taxable, or who have a permanent establishment in Luxembourg with whom the
holding of the euro exchange notes is connected, must for income tax purposes
include any interest received in their taxable income.

      Individual holders of euro exchange notes residing in Luxembourg who are
fully taxable are not subject to taxation on capital gains upon the disposal of
euro exchange notes unless the disposal of notes precedes the acquisition
thereof or the euro exchange notes are disposed of within six months of the date
of acquisition thereof. Upon a sale, repurchase or redemption of euro exchange
notes, individual holders of euro exchange notes residing in Luxembourg who are
fully taxable will, however, need to include the portion of the purchase,
repurchase or redemption price corresponding to accrued but unpaid interest in
their taxable income.

      A corporate entity, or societes de capitaux, which is a Luxembourg
resident which is fully taxable or which has a permanent establishment in
Luxembourg and holds euro exchange notes will need to include in its taxable
income the difference between the purchase, repurchase or redemption price
(including accrued but unpaid interest) and the lower of cost or book value of
the euro exchange notes sold, repurchased or redeemed. Such holders should not
be liable for any Luxembourg income tax on payment of principal, on exchange nor
upon redemption of euro exchange notes.

      No stamp, value added, issue, registration, transfer or similar taxes or
duties will be payable in Luxembourg by the holders of the euro exchange notes
as a consequence of the


                                       63
<PAGE>

exchange of the notes, nor will any such tax be payable as a consequence of a
subsequent transfer or redemption of the euro exchange notes.

                                  LEGAL MATTERS

      The validity of the exchange notes will be passed upon for us by Graubard
Mollen & Miller, New York, New York.

                                     EXPERTS

      The consolidated financial statements for us of December 31, 1998 and 1999
and for each of the years in the three-year period ended December 31, 1999 have
been audited by Grant Thornton LLP, independent certified public accountants, to
the extent and for the periods indicated in their reports thereon.

                       WHERE YOU CAN FIND MORE INFORMATION

      We have filed a registration statement on Form S-4 under the Securities
Act of 1933, as amended, with the SEC. This prospectus is part of that
registration statement and does not contain all of the information included in
the registration statement. For further information about us and our securities
you may refer to the registration statement and its exhibits and schedules as
well as the documents described below. You can review and copy these documents
at the public reference facilities maintained by the SEC or on the SEC's website
as described below.

      We also file annual, quarterly and special reports, proxy statements and
other information with the SEC. Our SEC filings are available to the public over
the Internet at the SEC's web site at http://www.sec.gov. You may also read and
copy any document we file at the SEC's public reference room at 450 Fifth
Street, N.W., Washington, D.C. 20549. These documents are also available at the
public reference rooms at the SEC's regional offices in New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public reference rooms. Our SEC filings are also available at the offices
of the Nasdaq National Market in Washington, D.C.

      The SEC allows us to "incorporate by reference" the information we file
with it, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
an important part of this prospectus, and information that we file later with
the SEC will automatically update and supersede this information. This
prospectus incorporates by reference our documents listed below and any future
filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the
Securities Exchange Act of 1934:

      o     Annual Report on Form 10-K, as amended, for the year ended December
            31, 1999;

      o     Quarterly Report on Form 10-Q filed May 15, 2000; and


                                       64
<PAGE>

      o     Current Report on Form 8-K filed June 1, 2000.

      We will provide any person to whom a prospectus is delivered a copy of any
and all of the documents incorporated in this prospectus by reference upon their
written or oral request. If you desire any of these documents, please contact us
as at Winstar Communications, Inc., 685 Third Avenue, New York, New York, 10017,
Attention: Investor Relations, 212/792-9800.


                                       65
<PAGE>

      Copies of the consent and letter of transmittal will be accepted. The
consent and letter of transmittal, outstanding notes and any other required
documents should be sent by each holder or his broker, dealer, commercial bank,
trust company or nominee to the exchange agent at the address set forth below:

      The exchange agent for the exchange offer and the consent solicitation is:

                     United States Trust Company of New York

                                    By Mail:

                          United States Trust Company
                                  of New York
                                  P.O. Box 844
                                 Cooper Station
                         New York, New York 10276-0844
                         (registered or certified mail
                                  recommended)

                              By Overnight Courier:

                           United States Trust Company
                                   of New York
                            770 Broadway, 13th Floor
                            New York, New York 10003
                          Attn: Corporate Trust Service

                                    By Hand:

                           United States Trust Company
                                   of New York
                            111 Broadway, Lower Level
                            New York, New York 10006
                         Attn: Corporate Trust Services

                                  By Facsimile:
                                 (212) 420-6211
                              Confirm by Telephone:
                                 (800) 548-6565

      Any questions or requests for assistance or additional copies of this
prospectus or the consent and letter of transmittal may be directed to the
information agent or the dealer managers and solicitation agents at their
respective telephone numbers and locations listed below. You may also contact
your broker, dealer, commercial bank, trust company or other nominee for
assistance concerning the exchange offer and the consent solicitation.

                 [Above information to be confirmed by Trustee]


                                       66

<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20.  Indemnification of Directors and Officers

         The Company's Certificate of Incorporation provides that all directors,
officers, employees and agents of the Registrant shall be entitled to be
indemnified by the Company to the fullest extent permitted by law.

         Section 145 of the Delaware General Corporation Law concerning
indemnification of officers, directors, employees and agents is set forth below.

         "Section 145. Indemnification of officers, directors, employees and
agents; insurance.

         (a) A corporation may indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of the corporation) by reason of the
fact that he is or was a director, officer, employee or agent of the
corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise, against expenses (including attorneys'
fees), judgments, fines and amounts paid in settlement actually and reasonably
incurred by him in connection with such action, suit or proceeding if he acted
in good faith and in a manner he reasonably believed to be in or not opposed to
the best interests of the corporation, and, with respect to any criminal action
or proceeding, had no reasonable cause to believe his conduct was unlawful. The
termination of any action, suit or proceeding by judgment, order, settlement,
conviction, or upon a plea of nolo contendere or its equivalent, shall not, of
itself, create a presumption that the person did not act in good faith and in a
manner which he reasonably believed to be in or not opposed to the best
interests of the corporation, and with respect to any criminal action or
proceeding, had reasonable cause to believe that his conduct was unlawful.

         (b) A corporation may indemnify any person who was or is a party or is
threatened to be made a party to any threatened, pending or completed action or
suit by or in the right of the corporation to procure a judgement in its favor
by reason of the fact that he is or was a director, officer, employee or agent
of the corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise against expenses (including attorneys' fees)
actually and reasonably incurred by him in connection with the defense or
settlement of such action or suit if he acted in good faith and in a manner he
reasonably believed to be in or not opposed to the best interests of the
corporation and except that no indemnification shall be made in respect of any
claim, issue or matter as to which such person shall have been adjudged to be
liable for negligence or misconduct in the performance of his duty to the
corporation unless and only to the extent that the Court of Chancery or the
court in which such action or suit was brought shall determine upon application
that, despite the adjudication of liability but in view of all the circumstances
of the case, such person is fairly and reasonably entitled to indemnity for such
expenses which the Court of Chancery or such other court shall deem proper.

                                      II-I

<PAGE>




         (c) To the extent that a director, officer, employee or agent of a
corporation has been successful on the merits or otherwise in defense of any
action, suit or proceeding referred to in subsections (a) and (b) of this
section, or in defense of any claim, issue or matter therein, he shall be
indemnified against expenses (including attorneys' fees) actually and reasonably
incurred by him in connection therewith.

         (d) Any indemnification under sections (a) and (b) of this section
(unless ordered by a court) shall be made by the corporation only as authorized
in the specific case upon a determination that indemnification of the director,
officer, employee or agent is proper in the circumstances because he has met the
applicable standard of conduct set forth in subsections (a) and (b) of this
section. Such determination shall be made (1) by the board of directors by a
majority vote of a quorum consisting of directors who were not parties to such
action, suit or proceeding, or (2) if such a quorum is not obtainable, or, even
if obtainable, a quorum of disinterested directors so directs, by independent
legal counsel in a written opinion, or (3) by the stockholders.

         (e) Expenses incurred by an officer or director in defending a civil or
criminal action, suite or proceeding may be paid by the corporation in advance
of the final disposition of such action, suit or proceeding upon receipt of an
undertaking by or on behalf of such director or officer, to repay such amount if
it shall ultimately be determined that he is not entitled to be indemnified by
the corporation as authorized in this section. Such expenses incurred by other
employees and agents may be so paid upon such terms and conditions, if any, as
the board of directors deems appropriate.

         (f) The indemnification and advancement of expenses provided by, or
granted pursuant to, the other subsections of this section shall not be deemed
exclusive of any other rights to which those seeking indemnification or
advancement of expenses may be entitled under any bylaw, agreement, vote of
stockholders or disinterested directors or otherwise, both as to action in his
official capacity and as to action in another capacity while holding such
office.

         (g) A corporation shall have power to purchase and maintain insurance
on behalf of any person who is or was director, officer, employee or agent of
the corporation, or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise against any liability asserted against him
and incurred by him in any such capacity, or arising out of his status as such,
whether or not the corporation would have the power to indemnify him against
such liability under this section.

         (h) For purposes of this section, references to "the corporation" shall
include, in addition to the resulting corporation, any constituent corporation
(including any constituent of a constituent) absorbed in a consolidation or
merger which, if its separate existence had continued, would have had power and
authority to indemnify its directors, officers, and employees or agents, so that
any person who is or was a director, officer, employee or agent of such
constituent corporation, or is or was serving at the request of such constituent
corporation as a director, officer, employee or agent of another corporation,
partnership, joint venture, trust or other enterprise, shall stand in the same
position under this section with respect to the resulting or

                                      II-II

<PAGE>



surviving corporation as he would have with respect to such constituent
corporation if its separate existence had continued.

         (i) For purposes of this section, references to "other enterprises"
shall include employee benefit plans; references to "fines" shall include any
excise taxes assessed on a person with respect to an employee benefit plan; and
references to "serving at the request of the corporation" shall include any
service as a director, officer, employee or agent of the corporation which
imposes duties on, or involves services by, such director, officer, employee or
agent with respect to an employee benefit plan, its participants or
beneficiaries; and a person who acted in good faith an in a manner he reasonably
believed to be in the interest of the participants and beneficiaries of an
employee benefit plan shall be deemed to have acted in a manner "not opposed to
the best interests of the corporation" as referred to in this section.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933, as amended (the "Securities Act"), may be permitted to directors,
officers, and controlling persons of the Company pursuant to the foregoing
provisions, or otherwise, the Company has been advised that in the opinion of
the Securities and Exchange Commission such indemnification is against public
policy as expressed in the Securities Act and is, therefore, unenforceable. In
the event that a claim for indemnification against such liabilities (other than
the payment by the Company of expenses incurred or paid by a director, officer
or controlling person of the Company in a successful defense of any action, suit
or proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Company will, unless in the
opinion of its counsel the matter has been settled by controlling precedent,
submit to the court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act and will be governed by the final adjudication of such issue.




                                      II-III

<PAGE>


ITEM 21.  Exhibits

Exhibit
Number   Description

4.3*     2008 Senior Notes Indenture, including form of 2008 Senior Note, dated
         as of April 10, 2000, between Winstar Communications, Inc,. as Issuer,
         and United States Trust Company of New York, as Trustee (incorporated
         by reference from the Exhibit of the same number as filed in the
         Company's Current Report on Form 8-K, dated March 3, 2000)

4.4*     2010 senior notes indenture, including form of 2010 senior note, dated
         as of April 10, 2000, between Winstar Communications, Inc., as issuer,
         and United States Trust Company of New York, as trustee (incorporated
         by reference from the exhibit of the same number as filed in the
         Company's Current Report on Form 8- K, dated March 3, 2000)

4.5*     Euro notes indenture, including form of euro note, dated as of April
         10, 2000, between Winstar Communications, Inc., as issuer, and United
         States Trust Company of New York, as trustee (incorporated by reference
         from the exhibit of the same number as filed in the Company's Current
         Report on Form 8-K, dated March 3, 2000)

4.6*     Senior discount notes indenture, including form of senior discount
         note, dated as of April 10, 2000, between Winstar Communications, Inc.,
         as issuer, and United States Trust Company of New York, as trustee
         (incorporated by reference from the exhibit of the same number as filed
         in the Company's Current Report on Form 8-K, dated March 3, 2000)

12.1     Ratio of earnings to fixed charges (incorporated by reference from the
         exhibit of the same number as filed in the Company's Registration
         Statement on Form S-3 (333-38492))

5.1*     Opinion of Graubard Mollen & Miller (filed herewith)

23.1     Consent of Grant Thornton LLP (filed herewith)

23.2*    Consent of Graubard Mollen & Miller (included in its opinion filed as
         Exhibit 5.1)

24.1     Powers of Attorney (included on the signature pages of this
         Registration Statement)

25.1*    Statement of Eligibility of United States Trust Company of New York on
         Form T-1

99.1*    Form of Letter of Transmittal

99.2*    Form of Notice of Guaranteed Delivery

------------------------


*        To be filed by amendment.


                                      II-IV

<PAGE>



ITEM 22.  Undertakings.

         (a) The undersigned registrant hereby undertakes:

         (1) To file, during any period in which offers or sales are being made,
a post-effective amendment of this registration statement:

                  (i) To include any prospectus required by Section 10(a)(3) of
the Securities Act of 1933;

                  (ii) To reflect in the prospectus any facts or events arising
after the effective date of the registration statement (or the most recent
post-effective amendment thereof) which, individually or in the aggregate,
represent a fundamental change in the information set forth in the registration
statement;

                  (iii) To include any material information with respect to the
plan of distribution not previously disclosed in the registration statement of
any material change to such information in the registration statement;

                  Provided, however, that paragraphs (1)(i) and (1)(ii) do not
apply if the registration statement is on Form S-3 or Form S-8 and the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed by the registrant pursuant to
Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
incorporated by reference in the registration statement.

         (2) That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (3) To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

         (b) The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

         (e) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrant pursuant to the foregoing provisions, or otherwise,
the registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy expressed in


                                      II-V

<PAGE>



the Securities Act of 1933 and is, therefore, unenforceable. In the event that a
claim for indemnification against such liabilities (other than the payment by
the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.


                                      II-VI

<PAGE>



                                   SIGNATURES


         Pursuant to the requirements of the Securities Act of 1933, as amended,
the registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-4 and has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of New York, State of New York, on this 6th day of
July, 2000.


                                     WINSTAR COMMUNICATIONS, INC.


                                     By: /s/ William J. Rouhana, Jr.
                                         ---------------------------
                                         William J. Rouhana, Jr.
                                         Chairman of the Board of Directors
                                         and Chief Executive Officer


                                POWER OF ATTORNEY


         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints William J. Rouhana, Jr. and/or Timothy R.
Graham his true and lawful attorneys-in-fact and agents, each acting alone, with
full power of substitution and resubstitution, for him and in his name, place
and stead, in any and all capacities, to sign any or all amendments to this
Registration Statement, including post-effective amendments, and to file the
same, with all exhibits thereto, and all documents in connection therewith, with
the Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done in and about the
premises, as fully to all intents and purposes as he might or could do in
person, and hereby ratifies and confirms all that said attorneys-in-fact and
agents, each acting alone, or their substitute or substitutes, may lawfully do
or cause to be done by virtue hereof.

         Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated.

<TABLE>
<CAPTION>

Name                                     Position                                          Date
----                                     --------                                          ----
<S>                                      <C>                                               <C>

 /s/ William J. Rouhana, Jr.             Chairman of the Board and Chief                   July 6, 2000
-----------------------------------      Executive Officer (principal executive
William J. Rouhana, Jr.                  officer)

</TABLE>



                                      II-VII

<PAGE>


<TABLE>
<CAPTION>

Name                                     Position                                          Date
----                                     --------                                          ----
<S>                                      <C>                                               <C>
 /s/ Nathan Kantor                       President, Chief Operating Officer and            July 6, 2000
-----------------------------------      Director
Nathan Kantor


 /s/ Timothy R. Graham                   Executive Vice President,  Secretary              July 6, 2000
-----------------------------------      and Director
Timothy R. Graham


 /s/ Richard Uhl                         Group Executive and Chief Financial               July 6, 2000
-----------------------------------      Officer (principal financial officer)
Richard J. Uhl


 /s/ Joseph P. Dwyer                     Senior Vice President - Finance                   July 6, 2000
-----------------------------------      (principal accounting officer)
Joseph P. Dwyer



 /s/ Bert W. Wasserman                   Director                                          July 6, 2000
-----------------------------------
Bert W. Wasserman


 /s/ William J. vanden Heuvel            Director                                          July 6, 2000
-----------------------------------
William J. vanden Heuvel


 /s/ Steven B. Magyar                    Director                                          July 6, 2000
----------------------------------
Steven B. Magyar


                                         Director                                          July 6, 2000
-----------------------------------
Hartley R. Rogers


 /s/ Lawrence R. Sorrel                  Director                                          July 6, 2000
-----------------------------------
Lawrence B. Sorrel


 /s/ James I. Cash                       Director                                          July 6, 2000
-----------------------------------
James I. Cash

</TABLE>



                                      II-VIII




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