HARBINGER CORP
S-3, 1996-08-27
COMPUTER PROGRAMMING, DATA PROCESSING, ETC.
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<PAGE>   1

                                                                       
                                                       
    As filed with the Securities and Exchange Commission on August 27, 1996
                                                       Registration No.
                                                                       ---------
================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                           WASHINGTON, D.C. 20549

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

                                  FORM S-3
                             REGISTRATION STATEMENT
                        UNDER THE SECURITIES ACT OF 1933

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

                            HARBINGER CORPORATION
             (Exact name of issuer as specified in its charter)


           GEORGIA                                          58-1817306
   (State of Incorporation)              (I.R.S. Employer Identification Number)

                           1055 LENOX PARK BOULEVARD
                            ATLANTA, GEORGIA  30319
                                 (404) 841-4334
          (Address, including zip code and telephone number, including
             area code, of registrant's principal executive offices
                        and principal place of business)

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

                                 C. TYCHO HOWLE
                            CHIEF EXECUTIVE OFFICER
                             HARBINGER CORPORATION
                           1055 LENOX PARK BOULEVARD
                            ATLANTA, GEORGIA  30319
                                 (404) 841-4334
                              (404) 841-4399 (FAX)
               (Name, address, including zip code, and telephone
               number, including area code, of agent for service)

                                   Copies to:
                              JOHN C. YATES, ESQ.
                           LARRY W. SHACKELFORD, ESQ.
                        MORRIS, MANNING & MARTIN, L.L.P.
                         1600 ATLANTA FINANCIAL CENTER
                           3343 PEACHTREE ROAD, N.E.
                            ATLANTA, GEORGIA  30326
                                 (404) 233-7000
                              (404) 365-9532 (FAX)      

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

         APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: At
such time or times after the effective date of this Registration Statement as
the Selling Shareholders shall determine.

         If any of the securities being registered on this Form are offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, please check the following box. [ ]

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
======================================================================================================================
                                           Amount          Proposed maximum       Proposed maximum        Amount of
 Title of each class of securities         to be          offering price per     aggregate offering     registration
          to be registered               registered            share (1)             price (1)               fee
- ----------------------------------------------------------------------------------------------------------------------
 <S>                                   <C>                      <C>                <C>                    <C>
 Common Stock, $.0001 par value        743,125 shares           $25.75             $19,135,468.75         $6,598.44
======================================================================================================================
</TABLE>

(1) Estimated pursuant to Rule 457(c) solely for the purpose of calculating the
    amount of registration fee, based upon the average of the high and low
    prices reported on August 21, 1996, as reported on the Nasdaq Stock Market.

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

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL 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 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SECTION 8(A), MAY
DETERMINE.

                 The Index to Exhibits is located at Page II-5.


<PAGE>   2

PROSPECTUS
                                 743,125 SHARES
                                [HARBINGER LOGO]
                                  COMMON STOCK   
                                ---------------  

         This Prospectus relates to up to 743,125 shares of common stock (the
"Shares") of Harbinger Corporation, a Georgia corporation (the "Company"),
which may be offered from time to time by the selling shareholders named herein
(the "Selling Shareholders").  See "Selling Shareholders."  The Company will
not directly receive any of the proceeds from the sale of the Shares, but may
benefit indirectly from the sale of certain of the Shares.  See "Risk Factors
- -- SSA Relationship."

         The Shares being registered were issued in connection with the
acquisitions (the "Acquisitions") of substantially all of the assets of each of
INOVIS GmbH & Co. computergestutze Informationssysteme ("INOVIS") and NTEX
Holding B.V. ("NTEX") by the Company, the acquisition of certain minority
interests in Harbinger NV, and the acquisition of certain assets from System
Software Associates, Inc. ("SSA").  Pursuant to the terms of the Acquisitions,
the Company agreed to register the Shares received by each Selling Shareholder
in connection with the Acquisitions.

         The Company has been advised by each Selling Shareholder that he
expects to offer his Shares through brokers or dealers to be selected by him
from time to time.  The Shares may be offered for sale through the Nasdaq Stock
Market, in the over-the-counter market, in one or more private transactions, or
a combination of such methods of sale, at prices and on terms then prevailing,
at prices related to such prices, or at negotiated prices.  Each Selling
Shareholder may pledge all or a portion of the Shares owned by him as
collateral in loan transactions.  Upon default by such Selling Shareholder the
pledgee in such loan transaction would have the same rights of sale as such
Selling Shareholder under this Prospectus to the extent it remains part of an
effective registration statement.  Each Selling Shareholder may also transfer
Shares owned by him by gift and upon any such transfer the donee would have the
same rights of sale as such Selling Shareholder under this Prospectus.  In
addition, any securities covered by this Prospectus which qualify for sale
pursuant to Rule 144 of the Securities Act of 1933, as amended (the "1933
Act"), may be sold under Rule 144 rather than pursuant to this Prospectus.
Finally, each Selling Shareholder and any brokers and dealers through whom
sales of the Shares are made may be deemed to be "underwriters" within the
meaning of the 1933 Act, and the commissions or discounts and other
compensation paid to such persons may be regarded as underwriters'
compensation.

         The Shares are traded on the Nasdaq Stock Market.  The average of the
high and low prices of the Shares as reported on the Nasdaq Stock Market on
August 21, 1996, was $25.75 per share.

         SEE "RISK FACTORS" BEGINNING ON PAGE 3 OF THIS PROSPECTUS FOR A
DISCUSSION OF CERTAIN FACTORS THAT SHOULD BE CONSIDERED BY PROSPECTIVE
PURCHASERS OF THE COMMON STOCK OFFERED HEREBY.

    THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
    AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION, NOR HAS THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS.  ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>
=======================================================================================================================
                                       Price to              Underwriting Discounts and        Proceeds to Selling
                                        Public                     Commissions (1)               Shareholders (2)
- -----------------------------------------------------------------------------------------------------------------------
         <S>                        <C>                              <C>                          <C>
         Per Share. . . .               $25.75                          $.64                          $25.11
                                                                                                            
         Total . . . . . .          $19,135,468.75                   $478,386.72                  $18,657,082.03
=======================================================================================================================
</TABLE>

(1)  Estimated brokerage commissions to be paid by selling shareholders.
(2)  Before deducting estimated expenses of the offering estimated at
     $36,598.44, all of which will be paid by the Company.


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

               THE DATE OF THIS PROSPECTUS IS AUGUST ____, 1996.

<PAGE>   3

                             AVAILABLE INFORMATION

         The Company is subject to the informational requirements of the
Securities Exchange Act of 1934 and files reports and other information with
the Securities and Exchange Commission (the "Commission") in accordance
therewith.  Such reports, proxy statements, and other information filed by the
Company are available for inspection and copying at the public reference
facilities of the Commission at Room 1024, 450 Fifth Street, N.W., Judiciary
Plaza, Washington, D.C.  20549, and at the Commission's Regional Offices
located at Room 1028, Jacob K. Javits Federal Building, 26 Federal Plaza, New
York, New York  10278 and Room 3190, Kluczynski Federal Building, 230 South
Dearborn Street, Chicago, Illinois  60604.  Copies of such material may be
obtained by mail from the Public Reference Section of the Commission at 450
Fifth Street, N.W., Judiciary Plaza, Washington, D.C.  20549, at prescribed
rates.  The Commission maintains a World Wide Web site on the Internet that
contains reports, proxy and information statements and other information
regarding registrants which file electronically with the Commission at
http:\\www.sec.gov.  The Company's common stock is listed on the Nasdaq Stock
Market.  In addition to the addresses listed above, reports, proxy statements,
and other information concerning the Company can be inspected at the offices of
the Nasdaq Stock Market.

               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE

         The following documents filed by the Company with the Commission are
incorporated by reference in this Prospectus:

         1.      The Company's Annual Report on Form 10-K for the year ended
December 31, 1995.

         2.      The Company's Proxy Statement dated May 8, 1996.

         3.      The Company's Quarterly Report on Form 10-Q for the quarter
ended March 31, 1996.

         4.      The Company's Quarterly Report on Form 10-Q for the quarter
ended June 30, 1996.

         5.      The description of the Common Stock of the Company which is
contained in the Company's Form 8-A/A Amendment No. 1 dated August 21, 1995, as
incorporated by reference therein from the Company's Pre-Effective Amendment
No. 4 to its Registration Statement on Form S-1 dated August 18, 1995.

         6.      The Company's Current Report on Form 8-K/A Amendment No. 1
dated December 26, 1995, and filed January 24, 1996.

         7.      The Company's Current Report on Form 8-K dated January 2,
1996, and filed on January 3, 1996.

         8.      The Company's Current Report on Form 8-K dated April 4, 1996,
and filed on April 18, 1996, as amended by it's Current Report on Form 8-K/A
Amendment No. 1 dated April 4, 1996, and filed June 17, 1996.

         9.      The Company's Current Report on Form 8-K dated April 19, 1996,
and filed on May 2, 1996, as amended by it's Current Report on Form 8-K/A
Amendment No. 1 dated April 19, 1996, and filed July 1, 1996.

         10.     The Company's Current Report on Form 8-K dated April 20, 1996,
and filed on May 3, 1996, as amended by it's Current Report on Form 8-K/A
Amendment No. 1 dated April 20, 1996, and filed July 2, 1996.

         All documents filed by the Company pursuant to Sections 13(a), 13(c),
14 or 15(d) of the Exchange Act subsequent to the date of this Prospectus and
prior to the termination of the offering of the Shares offered hereby shall be
deemed to be incorporated by reference into this Prospectus and to be a part
hereof.

         The Company hereby undertakes to provide without charge to each person
to whom this Prospectus has been delivered, upon the written or oral request of
any such person, a copy of any and all of the foregoing documents incorporated
herein by reference (other than exhibits to such documents which are not
specifically incorporated by reference into the information that this
Prospectus incorporates).  Written or telephone requests should be directed to
Investor Relations Department, Harbinger Corporation, 1055 Lenox Park
Boulevard, Atlanta, Georgia  30319, telephone number (404) 841-4334.

         This Prospectus constitutes a part of a Registration Statement which
the Company has filed with the Commission under the 1933 Act, with respect to
the Shares.  This Prospectus omits certain of the information contained in the
Registration Statement, and reference is hereby made to the Registration
Statement and related Exhibits thereto for further information with respect to
the Company and the securities offered hereby.  Such additional information can
be obtained from the Commission's office in Washington, D.C.  Any statements
contained herein concerning the provisions of any documents are not necessarily
complete, and, in each instance, reference is made to the copy of such document
filed as an exhibit to the Registration Statement or otherwise filed with the
Commission.  Each such statement is qualified in its entirety by such
reference.



<PAGE>   4

                                  THE COMPANY

         Harbinger Corporation ("Harbinger" or the "Company") develops, markets
and supports software products worldwide and provides computer communications
network and consulting services which enable businesses to engage in electronic
commerce.  Businesses exchange information and documents and complete business
transactions through electronic commerce, which includes electronic data
interchange (EDI), electronic mail (E-Mail), electronic funds transfer (EFT),
electronic forms, bulletin boards and electronic catalogue services.  The
Company's objective is to be a leading worldwide provider of electronic
commerce products and services to businesses by offering comprehensive,
customizable, standards-based electronic commerce solutions.  Harbinger offers
software products that operate on multiple computer platforms, a secure and
reliable computer network to facilitate the transmission of business
information and transactions, and value-added products and services to enable
businesses of all sizes to maximize the number and value of their electronic
trading relationships.  The Company's products and services facilitate
electronic commerce by businesses and financial institutions by providing the
ability to electronically transmit and receive routine business information and
documents in a standard format.  The Harbinger value-added network (VAN) serves
as an electronic communications link for computer systems by receiving, storing
and forwarding electronically transmitted business documents and data for
re-transmission in a form that can be received and interpreted by the computer
of another commercial business.  Harbinger facilitates the electronic link to
its computer communications network through the sale of electronic commerce
software packages for use in a broad range of computing environments, including
DOS, Windows, Windows NT, UNIX, IBM AS/400 midrange and IBM MVS mainframe
platforms.  The Company's principal executive offices are located at 1055 Lenox
Park Boulevard, Atlanta, Georgia 30319 and its telephone number is (404)
841-4334.

                                  RISK FACTORS

         Factors Affecting Operating Results; Potential Fluctuations in
Quarterly Results.  The Company's quarterly operating results have in the past
and may in the future vary or decrease significantly depending on factors such
as revenue from software sales, the timing of new product and service
announcements, changes in pricing policies by the Company and its competitors,
market acceptance of new and enhanced versions of the Company's products, the
size and timing of significant orders, changes in operating expenses, changes
in Company strategy, personnel changes, the introduction of alternative
technologies, the effect of potential acquisitions and general economic
factors.  The Company has limited or no control over many of these factors.
The Company has experienced losses in the past, and at June 30, 1996, had an
accumulated deficit of approximately $14.1 million.  The Company operates with
virtually no network services or software product order backlog because its
network services are purchased on demand and its software products typically
are shipped shortly after orders are received.  As a result, revenues in any
quarter are substantially dependent on the quantity of purchases of services
requested and product orders received in that quarter.  Quarterly revenues also
are difficult to forecast because the market for electronic commerce and EDI
software products is rapidly evolving and the Company's revenues in any period
are significantly affected by the announcements and product offerings of the
Company's competitors as well as alternative technologies.  The Company's
expense levels are based, in part, on its expectations as to future revenues.
If revenue levels are below expectations, the Company may be unable or
unwilling to reduce expenses proportionately and operating results are likely
to be adversely affected.  As a result, the Company believes that
period-to-period comparisons of its results of operations are not necessarily
meaningful and should not be relied upon as indications of future performance.
Due to all of the foregoing factors, it is likely that in some future quarter
the Company's operating results will be below the expectations of public market
analysts and investors.  In such event, the price of the Company's Common Stock
will likely be adversely affected.

         The Company recognizes revenues for its software products at the time
of installation in the case of PC-based EDI software and upon the later of
shipment or fulfillment of all significant post-contract vendor obligations in
the case of other software products.  Customers using the Company's PC products
are permitted to return products after delivery for a specified period,
generally 60 days.  The Company generally has experienced returns of
approximately 20% of the PC product sales, and the Company records revenues
after a deduction for estimated returns.  Any material increase in the
Company's return experience could have an adverse effect on its operating
results.





                                       3


<PAGE>   5


         Investment in Harbinger NET Services.  The Company has invested $8.4
million to date in Harbinger NET Services, LLC ("HNS").  HNS was established in
1995, has had no substantial revenues, and has incurred and is expected to
continue producing substantial losses in its initial years of operations.  It
is expected that into 1997 the Company will report its interest in the income
or losses of HNS by the equity method of accounting and will provide any
summarized financial information concerning HNS and separate audited financial
statements of HNS as may be required by applicable accounting rules and
regulations.  The Company's interest in HNS's losses have and will continue to
reduce the Company's operating and net income and may cause the Company to
report losses in future periods.  Depending on operating results in the next
year, it is anticipated that HNS will require additional financing in future
periods.  There can be no assurance that this additional financing will be
available or that this financing will not dilute or otherwise affect the
Company's interest in HNS.

         HNS was organized to develop software products and provide related
services for conducting electronic commerce over the Internet.  There can be no
assurance that HNS will overcome the substantial technological issues that will
be faced in developing acceptable technologies for conducting electronic
commerce over the Internet.  These technological issues include the ability to
provide secure communication of commercial data over the Internet by encryption
or other means, and the ability to assure the integrity, accuracy and
reliability of data sent and received over the Internet.  HNS will face other
significant risks inherent in a start-up enterprise, including the likelihood
of significant operating losses, risk of product development and market
acceptance, intense competition, risk of the effect of technological change on
the introduction of new products and technologies, and the likelihood of the
need for substantial equity capital in addition to the capital already invested
by the Company.  The Company's investment in HNS involves considerable risk and
the Company may lose its entire investment in HNS.

         The Company has several agreements with HNS governing certain
transactions between them, including the use of personnel, the management and
operation of HNS, the use by HNS of the Company's products and services, the
Company's right to license and distribute HNS products, if any, derived from
the Company's products and the payment by HNS and the Company of royalties and
other amounts.  There is no assurance that the Company will receive ongoing
royalties or other fees from HNS, that the Company will be able to license and
distribute the products developed by HNS, or that the agreements with HNS will
continue in effect.  The Company's revenues and business could be adversely
affected by the development of the electronic commerce business over the
Internet by HNS.  There is no assurance that the Company's contractual
relationships with HNS or ownership interest in HNS will compensate for any
such adverse effect.

         The Operating Agreement among the Company, HNS and its shareholders
grants certain designated shareholders, presently including the Company and
BellSouth Corporation ("BellSouth"), the right after December 1, 1996 to
initiate a buy-sell procedure with respect to the shares owned by such
designated shareholders.  Under this buy-sell arrangement, any such designated
shareholder may offer to buy or sell the HNS shares held by the other
designated shareholders at a specified price, in which case the other
designated shareholders will be required either to buy or sell their shares.
Under this arrangement, the Company could be required to make a decision
whether to sell its HNS shares or to purchase the HNS shares held by other
designated shareholders at a point in time when the Company has insufficient
funds to purchase such HNS shares.  Upon such occurrence, and if the Company
desires to purchase HNS shares from the designated shareholders, there is no
assurance the Company will be able to obtain financing on acceptable terms and,
in such case, the Company could be required to sell its HNS shares on terms
which would otherwise be unacceptable to the Company.  The Company is
restricted in its ability to transfer its HNS shares outside of this buy-sell
arrangement, and may not transfer its HNS common shares without the approval of
all of the members of the Board of Managers of HNS and the approval of the
holders of at least 50% of the outstanding HNS common shares, excluding the
shares proposed to be transferred.

         Although the Company owns approximately 70% of the equity of HNS
(assuming conversion of the BellSouth Debenture and the exercise of outstanding
HNS options), the Company does not control the business and operations of HNS.
Until January 1, 1997, the Company has the right to appoint only a minority of
the members of the Board of Managers of HNS, and the Board of Managers has
broad rights regarding the operation and direction of the business of HNS.
Even if the Company ultimately controls the Board of Managers, the Board of
Managers will have an obligation to act in the best interest of HNS.
Consequently, it is possible that HNS will make business





                                       4
<PAGE>   6

decisions that may be adverse to the interests of the Company.  Several
executive officers of the Company also are executive officers of HNS, have a
direct equity investment in HNS, and devote a substantial portion of their time
to the business and affairs of HNS.  These relationships divert their time and
attention from the Company's affairs and could give rise to potential
conflicting interests.

         Because the Company owns approximately a 70% of the equity interest in
HNS (assuming conversion of the BellSouth Debenture and the exercise of
outstanding HNS options), the Company and its shareholders will only realize
benefits from the Company's investment in HNS proportionate with its equity
interest.  Additional funding which may be required in the future to support
HNS could dilute or otherwise affect the Company's equity interest in HNS.
Accordingly, shareholders in the Company should recognize that they will not
directly share in 100% of any profits or increase in the value of the Company's
equity interest in HNS, and a portion of any such profit and increase in value
will be realized by the other investors in HNS, including certain officers,
directors and existing shareholders of the Company.

         Integration of Recent Acquisitions; Risks of Potential Future
Acquisitions.  There can be no assurance that the Company can successfully
assimilate its operations and integrate its software products with the
operations, software products and technologies recently acquired in the NTEX,
INOVIS and Harbinger NV acquisitions.  Any delay in such integration could
result in loss of product revenues and have a material adverse effect on the
Company.  Similar operations and software integration problems may arise if the
Company undertakes future acquisitions.

         The Company may in the future pursue additional acquisitions of
complementary products, technologies or businesses.  Future acquisitions may
result in potentially dilutive issuances of equity securities, the incurrence
of additional debt, the write-off of in-process product development and
capitalized product costs, and the amortization of expenses related to goodwill
and other intangible assets, all of which could have a material adverse effect
on the Company.  Future acquisitions will involve numerous additional risks,
including difficulties in the assimilation of the operations, products and
personnel of the acquired company, the diversion of management's attention from
other business concerns, risks of entering markets in which the Company has
little or no direct prior experience, and the potential loss of key employees
of the acquired company.

         Investment in Harbinger NV, NTEX and INOVIS.  The Company believes
that its continued growth and profitability will require expansion of its
international revenues.  This expansion will require financial resources and
significant management attention, particularly by certain members of the
management of the Company who are officers of or provide assistance to
Harbinger NV, NTEX and INOVIS (the "International Subsidiaries").  The Company
may need to make additional loans to or investments in the International
Subsidiaries for working capital purposes or to fund acquisitions of
complementary products, technologies or businesses.  Each of the International
Subsidiaries has experienced significant operating losses to date.  To the
extent that the International Subsidiaries are unable to penetrate
international markets in a timely and profitable manner, the Company's growth,
if any, in international sales will be limited, and the Company could be
materially adversely affected.  In addition, there can be no assurance that the
Company will be able to maintain or increase international market demand for
the Company's products.

         SSA Relationship.  Under its Alliance Agreement with System Software
Associates, Inc. ("SSA"), the Company granted licenses to SSA to use and sell
certain software products of the Company in return for royalty payments.  The
SSA Alliance Agreement establishes minimum royalty payments which must be made
by SSA.  In connection with the inclusion of the Shares being offered by SSA in
this offering, SSA has agreed to apply the proceeds of the sale of up to
275,000 of such Shares to the payment of the minimum royalties as due under the
Alliance Agreement.  Nevertheless, there is no assurance that the proceeds from
the sale of the Shares being offered by SSA in this offering will be sufficient
to satisfy the minimum royalties or that any royalties in excess of the minimum
will ever be paid.

         The Internet.  The Internet, which is an interconnected global network
of computer networks linked together through a common protocol, provides a
potential alternative means of providing electronic commerce to business
trading partners.  The market for Internet software and services is both
emerging and highly competitive,





                                       5

<PAGE>   7

ranging from small companies with limited resources such as HNS to large
companies with substantially greater financial, technical and marketing
resources than the Company and HNS.  The Company believes that existing
competitors are likely to expand the range of their electronic commerce
services to include Internet services.  Moreover, new competitors, which may
include telephone companies and media companies, are likely to increase the
provision of business-to-business data transmission services using the
Internet.  Use of the Internet for business-to-business electronic commerce
services raises numerous issues that, to the knowledge of the Company, have yet
to be satisfactorily resolved.  Such issues include reliability, data security
and data integrity.  If the Internet becomes an accepted method of electronic
commerce, the Company could lose network customers which would reduce recurring
revenue from network services and have a material adverse effect on the
Company.  There can be no assurance that the Company's interest in or
contractual relationships with HNS will compensate for any adverse effect
resulting from the adoption of the Internet as an accepted alternative for
electronic commerce transmissions.

         Intense Competition.  The electronic commerce, EDI and network
services and products businesses are intensely competitive and the Company has
many competitors with substantially greater financial, marketing, personnel and
technological resources than the Company.  Other companies offer products and
services that may be considered by customers to be acceptable alternatives to
the Company's products and services.  Certain companies also operate private
computer networks for transacting business with their trading partners.  It is
expected that other companies may develop and implement similar
computer-to-computer networks, some of which may be "public" networks such as
the Company's and others may be "private," providing services only to a
specific group of trading partners, thereby reducing the Company's ability to
increase sales of its network services.  In addition, several companies offer
PC-based, UNIX, midrange and mainframe computer software products which compete
with the Company's software products.  Advanced operating systems, such as
Microsoft's Windows 95, also may offer electronic commerce functions that limit
the Company's ability to sell its software products.  The Company believes that
the continuing acceptance of electronic commerce and EDI will attract new
competitors, including software applications and operating systems companies
that may bundle electronic commerce solutions with their programs, and
alternative technologies that may be more sophisticated and cost effective than
the Company's products and services.  Competitive companies may offer certain
electronic commerce products or services, such as communications software or
network transactional services, at no charge or a deeply discounted charge, in
order to obtain the sale of other products or services.  Since the Company's
agreements with its network subscribers are terminable upon 30 days' notice,
the Company does not have the contractual right to prevent its customers from
changing to a competing network.

         Technological Change; Dependence on New Products.  The electronic
commerce and EDI software markets are characterized by rapid technological
change, frequent new product introductions and evolving industry standards.
The Company's future success will depend in significant part on its ability to
anticipate industry standards, continue to apply advances in network and
product technologies, enhance its current products and network services, and
develop and introduce new products on a timely basis that keep pace with
technological developments.  There can be no assurance that the Company will be
successful in developing and marketing product enhancements or new products or
network services that respond to technological change or evolving industry
standards, that the Company will not experience difficulties that could delay
or prevent the successful development, introduction and marketing of these
products or services, or that its new products and services, and the
enhancements thereto, will adequately meet the requirements of the marketplace
and achieve market acceptance.  In the past, the Company has experienced delays
in the commencement of commercial shipments of new products and enhancements,
resulting in delays or loss of product revenues.  Such delays may result in
additional and unexpected expenses to fund product development or to add
programming personnel to complete a development project, and will reduce
revenue because of the inability to sell the new product on a timely basis and
the adverse impact that such delay may have on the demand for existing
products.  Any delay in the introduction of new products, or the failure of
such products or services to achieve market acceptance, will have a material
adverse effect on the Company.

         Dependence on Key Management and Personnel.  The Company's success is
largely dependent upon its executive officers, the loss of one or more of whom
could have a material adverse effect on the Company.  The future success of the
Company will depend in large part upon its ability to attract and retain
talented and qualified personnel.  In particular, the Company believes that it
will be important for the Company to hire experienced





                                       6
<PAGE>   8

product development personnel.  Competition in the recruitment of
highly-qualified personnel in the computer software and electronic commerce
industries is intense.  The inability of the Company to locate and retain such
personnel may have a material adverse effect on the Company.  No assurance can
be given that the Company can retain its key employees or that it can attract
qualified personnel in the future.  The Company currently carries key-person
life insurance policies on the lives of Messrs. Howle and Leach, and one other
officer of the Company.

         Management of the Company, including Messrs. Howle, Leach, Davis, Katz
and Meeker, are also involved in the management of HNS, thereby reducing the
amount of time that these persons expend directly on behalf of the Company.

         Risks of Product Development.  Software products as complex as those
offered by the Company may contain undetected errors or failures when first
introduced or when new versions are released.  If software errors are
discovered after introduction, the Company could experience delays or lost
revenues during the period required to correct these errors.  There can be no
assurance that, despite testing by the Company and by current and potential
customers, errors will not be found in new products or releases after
commencement of commercial shipments, resulting in loss of or delay in market
acceptance, additional and unexpected expenses to fund further product
development or to add programming personnel to complete a development project,
and loss of revenue because of the inability to sell the new product on a
timely basis, any one or more of which could have a material adverse effect on
the Company.

         Limited Protection of Proprietary Technology; Risks of Infringement.
The Company relies primarily on a combination of copyright, patent and
trademark laws, trade secrets, confidentiality procedures and contractual
provisions to protect its proprietary rights.  The Company seeks to protect its
software, documentation and other written materials principally under trade
secret and copyright laws, which afford only limited protection.  The Company
presently has one patent for an electronic document interchange test facility
and patent applications pending for an EDI communication system.  Despite the
Company's efforts to protect its proprietary rights, unauthorized parties may
attempt to copy aspects of the Company's products or to obtain and use
information that the Company regards as proprietary.  There can be no assurance
that the Company's means of protecting its proprietary rights will be adequate
or that the Company's competitors will not independently develop similar
technology.  In distributing its products, the Company relies primarily on
"shrink wrap" licenses that are not signed by licensees and, therefore, may
be unenforceable under the laws of certain jurisdictions.  In addition, the
laws of some foreign countries do not protect the Company's proprietary rights
to as great an extent as the laws of the United States.  The Company does not
believe that any of its products infringe the proprietary rights of third
parties.  There can be no assurance, however, that third parties will not claim
infringement by the Company with respect to current or future products.  The
Company expects that software product developers will increasingly be subject
to infringement claims as the number of products and competitors in electronic
commerce grows and the functionality of products in different industry segments
overlaps.  Any such claims, with or without merit, could be time-consuming,
result in costly litigation, cause product shipment delays or require the
Company to enter into royalty or licensing agreements.  Such royalty or
licensing agreements, if required, may not be available on terms acceptable to
the Company or at all, which could have a material adverse effect on the
Company.

         Potential Conflicts of Interests.  Certain officers and directors of
the Company also are officers and directors of HNS.  The Company is likely to
engage in ongoing transactions with HNS, and conflicts of interest could arise
between the Company and HNS.  No formal procedures have been adopted for
dealing with these conflicts of interest, although the Company intends that
material transactions between the Company and HNS will be structured to be on
terms no less favorable to the Company than terms which would be offered to an
unaffiliated third party, and that any such transactions will be subject to
approval by members of the Company's Board of Directors who are not officers or
directors of HNS.  There can be no assurance, however, that these conflicts of
interest will not have an adverse effect on the Company.

         Dependence on Data Centers.  The Company's network service operations
are dependent upon its ability to protect its computer equipment and the
information stored in its data centers against damage that may be caused by
fire, power loss, telecommunication failures, unauthorized intrusion, computer
viruses and disabling devices and other similar events.  The Company is party
to a disaster recovery agreement that provides an alternative off-site





                                       7
<PAGE>   9

computer system for use in such disastrous events, and the Company has taken
precautions to protect itself and its customers from events that could
interrupt delivery of the Company's network services.  These precautions
include off-location storage of computer software backup data, fire protection
and physical security systems, and an early warning detection and fire
extinguishing system.  Notwithstanding such precautions, there can be no
assurance that a fire or other natural disaster, including national, regional
or local telecommunications outages, would not result in a prolonged outage of
the Company's network services.  Although the Company maintains business
interruption insurance and has contractual access to an alternative off-site
computer system, in the event of a disaster, and depending on the nature of the
disaster, it may take from several hours to several days before the Company's
off-site computer system can become operational for all of the Company's
customers and use of the alternative off-site computer would result in
substantial additional cost to the Company.  In the event that an outage of the
Company's network extends for more than several hours, the Company will
experience a reduction in revenues by reason of such outage.  In the event that
such outage extends for one or more days, the Company could potentially lose
many of its customers which may have a material adverse effect on the Company.

         Government Regulatory and Industrial Policy Risks.  The Company's
network services are transmitted to its customers over dedicated and public
telephone lines.  These transmissions are governed by regulatory policies
establishing charges and terms for communications.  Changes in the legislative
and regulatory environment relating to online services, EDI or the Internet
access industry, including regulatory or legislative changes which directly or
indirectly affect telecommunication costs or increase the likelihood of
competition from regional telephone companies or others, could have an adverse
effect on the Company's business.  Congress has enacted, and President Clinton
signed, the Telecommunications Act of 1996 ("Act") to amend the federal
telecommunications laws to lift restrictions on regional telephone companies
and others competing with the Company and to impose certain restrictions
regarding obscene and indecent content communicated to minors over the Internet
or through interactive computer services.  The Act immediately lifts
restrictions on regional telephone companies providing transport between
defined geographic boundaries associated with the provision of its own
information services.  This will enable regional telephone companies to more
readily compete with the Company by packaging information service offerings
with other services.  Additionally, the Act imposes fines and other criminal
liability on any entity that knowingly uses a telecommunications device or
interactive computer service to send obscene or indecent material to minors or
permits any telecommunications facility under such entity's control to be used
for such a purpose.  The Act provides a defense for persons providing access or
a connection so long as the access or connection provider is not involved in
the creation of content.  Litigation has been filed in federal court
challenging the constitutionality of those provisions of the Act.   A temporary
restraining order has been issued by a federal court enjoining the U.S.
Attorney General from enforcing the Act's "indecency" prohibition.  This case
is currently on appeal. The ability of state regulators and/or the FCC to
impose regulations on the Internet is unclear.  At present the Internet is
treated by the FCC as an unregulated enhanced service.  The FCC is currently
considering a petition seeking to regulate voice communications over the
Internet.  In addition there are a number of bills currently being considered
at the federal and state levels involving encryption and digital signatures
that may impact the Company.  The Company cannot predict the impact, if any,
that the Act and future court opinions, legislation, regulations or regulatory
changes may have on its business.  Management believes that the Company is in
compliance with all material applicable regulations.

         Ability to Manage Growth.  The Company has experienced significant
revenue growth in the last five years as it has added subscribers to the
Harbinger network.  Maintaining profitability during a period of expansion will
depend, among other things, on the Company's ability to successfully expand its
products, services and markets and to manage its operations effectively.
Difficulties in managing continued growth, including difficulties in obtaining
and retaining talented management and product development personnel, could have
a material adverse effect on the Company.

         Anti-Takeover Provisions.  The Board of Directors has authority to
issue up to 20,000,000 shares of preferred stock and to fix the rights,
preferences, privileges and restrictions, including voting rights, of the
preferred stock without further vote or action by the Company's shareholders.
The rights of the holders of Common Stock will be subject to, and may be
adversely affected by, the rights of the holders of any preferred stock that
may be issued in the future.  While the Company has no present intention to
issue additional shares of preferred stock, such issuance, while providing
desired flexibility in connection with possible acquisitions and other
corporate purposes,





                                       8
<PAGE>   10

could have the effect of making it more difficult for a third party to acquire
a majority of the outstanding voting stock of the Company.  In addition, the
Company's Amended and Restated Articles of Incorporation and Bylaws contain
provisions that may discourage proposals or bids to acquire the Company.  This
could limit the price that certain investors might be willing to pay in the
future for shares of Common Stock.  The Company's Amended and Restated Articles
of Incorporation provide for a classified Board of Directors with three-year,
staggered terms for its members.  The classification of the Board of Directors
could have the effect of making it more difficult for a third party to acquire
control of the Company.

                              SELLING SHAREHOLDERS

         The following table sets forth certain information regarding
beneficial ownership of the Company's Shares by the Selling Shareholders at
July 31, 1996.

<TABLE>
<CAPTION>
                                             Harbinger
                                        Shares Beneficially          Number of              Shares Beneficially
                                    Owned Prior to Offering(2)         Shares             Owned After Offering(2)
        Name of Selling            ---------------------------         ------             -------------------------  
        Shareholders(1)                Number         Percent         Offered             Number            Percent  
        ---------------                ------         -------         -------             ------            -------  
 <S>                                   <C>            <C>             <C>                 <C>               <C>
 INOVIS:
 ------ 
 Dr. Jacob Karszt+                      53,277           *             44,687               8,590              *
 Eugen Volbers                          19,819           *             16,478               3,341              *
 Helmut Grimm+                          20,719           *             17,378               3,341              *
 Hans Arthur Rauh+                      14,799           *             12,413               2,386              *
 Jorg Blum+                             12,431           *             10,427               2,004              *
 Ulrich Rehn+                            5,919           *              4,965                 954              *
 Prof. Dr. Wolffried Stucky              5,444           *              4,203               1,241              *
 Jurgen Matthias Diet                    3,888           *              3,002                 886              *
 Dr. Niklai Preiss                       3,888           *              3,002                 886              *
                                       -------                        -------              ------               
         INOVIS Total                  140,184         1.30%          116,555              23,629              *

 NTEX :
 ----  
 F.J. Nederlof B.V. +                   35,133           *             35,133                 --               *
 Ir A.G. Nederlof B.V. +                35,133           *             35,133                 --               *      
 H.W. I. Bol+                            2,972           *              2,972                 --               *
                                       -------                        -------                                          
         NTEX Total                     73,238           *             73,238                 --               *    
                                                                                                                    

 A. J. van Diepen                          666           *                666                 --               *
 Henk P.M. Kivits                        2,666           *              2,666                 --               *   
 SSA                                   550,000         5.11%          550,000                 --               *   
                                       -------                        -------             -------                  
                                                                                                                   
 TOTAL SELLING SHAREHOLDERS            766,754         7.12%          743,125              23,629              *
- -----------------                                                                                                       
</TABLE>

(1) Certain of the Selling Shareholders, indicated with a "+", have recently
    become employees of the Company.  Mr.  Kivits is a director of the Company,
    and Roger E. Covey, a director of the Company, is an officer and director
    of SSA.  Otherwise, the Selling Shareholders have no material relationship
    with the Company.
(2) Based on 10,772,125 shares of Common Stock outstanding as of July 31, 1996.
    In accordance with Rule 13d-3 under the Exchange Act, a person is deemed to
    be the beneficial owner, for purposes of this table, of any shares of
    Common Stock if such person has or shares voting power or investment power
    with respect to such security, or has the right to acquire beneficial
    ownership at any time within 60 days from July 31, 1996.  As used herein,
    "voting power" is the power to vote or direct the voting of shares and
    "investment power" is the power to dispose or direct the disposition of
    shares.  An asterisk (*) indicates less than 1% of the issued and
    outstanding shares of the Common Stock.

                                 LEGAL MATTERS

         The validity of the shares of the Common Stock offered  hereby will be
passed upon for the Company by Morris, Manning & Martin, L.L.P., Atlanta,
Georgia.





                                       9
<PAGE>   11



                                    EXPERTS

         The financial statements and schedule of the Company as of December
31, 1995, and for the year then ended, have been incorporated by reference
herein and in the registration statement from the Company's Annual Report on
Form 10-K in reliance upon the reports of KPMG Peat Marwick LLP, independent
certified public accountants, incorporated by reference herein and in the
registration statement and upon the authority of said firm as experts in
accounting and auditing.

         The financial statements and schedule of the Company as of December
31, 1994 and for each of the two years in the period then ended, which have
been incorporated by reference herein and in the registration statement from
the Company's Annual Report on Form 10-K, have been audited by Arthur Andersen
LLP, independent public accountants, as indicated in their report with respect
thereto, and are incorporated by reference herein and in the registration
statement in reliance upon the authority of said firm as experts in accounting
and auditing in giving said reports.

         The consolidated financial statements for NTEX for December 31, 1995,
incorporated by reference in this Prospectus from the Company's Current Report
on Form 8-K/A Amendment No. 1 dated April 4, 1996, and filed June 17, 1996,
have been audited by Moret Ernst & Young Accountants, independent public
accountants, as stated in their report which is incorporated herein by
reference, and have been so incorporated in reliance upon such report given
upon the authority of said firm as experts in accounting and auditing.

         The financial statements of INOVIS as of December 31, 1995, and for
the year then ended have been incorporated by reference herein and in the
registration statement from the Company's Current Report of Form 8-K/A
Amendment No. 1 dated April 19, 1996, and filed July 1, 1996, in reliance upon
the report of KPMG Deutsche Truehand-Gesellschaft, independent certified public
accountants, incorporated by reference herein and in the registration statement
and upon the authority of said firm as experts in accounting and auditing.

         The consolidated financial statements of Harbinger N.V. and
subsidiaries as of December 31, 1995, 1994, and 1993, and for the two years
ended December 31, 1995, and 1994, and the one month ended December 31, 1993,
have been incorporated by reference herein and in the registration statement
from the Company's Current Report on Form 8-K/A Amendment No. 1 dated April 20,
1996, and filed July 2, 1996, in reliance upon the report of KPMG Accountants
N.V., independent certified public accountants, incorporated by reference
herein and in the registration statement and upon the authority of said firm as
experts in accounting and auditing.

                      DISCLOSURE OF COMMISSION POSITION ON
                 INDEMNIFICATION FOR SECURITIES ACT LIABILITIES

         The Company's Amended and Restated Articles of Incorporation
authorizes the Company to indemnify any present or former director, officer,
employee, or agent of the Company, or a person serving in a similar post in
another organization at the request of the Company, against expenses,
judgments, fines, and amounts paid in settlement incurred by him in connection
with any threatened, pending, or completed action, suit, or proceeding, whether
civil, criminal, administrative, or investigative, to the fullest extent not
prohibited by the Georgia Business Corporation Code, public policy or other
applicable law.  The Georgia Business Corporation Code authorizes a corporation
to indemnify its directors, officers, employees, or agents in terms
sufficiently broad to permit such indemnification under certain circumstances
for liabilities (including provisions permitting advances for expenses
incurred) arising under the 1933 Act.

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





                                       10


<PAGE>   12

counsel the matter has been settled by controlling precedent, submit to a court
of appropriate jurisdiction the questions whether such indemnification by it is
against public policy as expressed in the 1933 Act and will be governed by the
final adjudication of such issue.





                                       11


<PAGE>   13

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

NO PERSON HAS BEEN AUTHORIZED IN CONNECTION WITH
THE OFFERING MADE HEREBY TO GIVE ANY INFORMATION
OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN
THIS PROSPECTUS AND, IF GIVEN OR MADE, SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED
UPON AS HAVING BEEN SO AUTHORIZED BY THE COMPANY,          743,125 SHARES    
ANY SELLING SHAREHOLDER OR ANY UNDERWRITER.  THIS                            
PROSPECTUS DOES NOT CONSTITUTE ANY OFFER TO SELL                             
OR A SOLICITATION OF AN OFFER TO BUY ANY OF THE           [HARBINGER LOGO]   
SECURITIES OFFERED HEREBY TO ANY PERSON OR BY                                
ANYONE IN ANY JURISDICTION TO WHICH IT IS UNLAWFUL          COMMON STOCK       
TO MAKE SUCH OFFER OR SOLICITATION.  NEITHER THE                               
DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE                                  
HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES, CREATE                               
ANY IMPLICATION THAT THE INFORMATION HEREIN IS                                 
CORRECT AS OF ANY DATE SUBSEQUENT TO THE DATE                                  
HEREOF.                                                                        
                                                                               
                                                                               
            -------------------                                                
                                                                               
                                                                               
               TABLE OF CONTENTS                                               
<TABLE>                                                                        
<CAPTION>                                                                       
                                          Page                                 
<S>                                        <C>                                 
Available Information   . . . . . . . .    2                                   
Incorporation of Certain Information                                           
  by Reference  . . . . . . . . . . . .    2                                   
The Company   . . . . . . . . . . . . .    3                                   
Risk Factors  . . . . . . . . . . . . .    3                                   
Selling Shareholders  . . . . . . . . .    9              ----------------   
Legal Matters.  . . . . . . . . . . . .    9                 PROSPECTUS      
Experts.  . . . . . . . . . . . . . . .    10             ----------------   
Disclosure of Commission Position on                                         
  Indemnification for Securities Act                                         
  Liabilities   . . . . . . . . . . . .    10                                
</TABLE>                                                                     


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


UNTIL ________________, 1996, ALL DEALERS
EFFECTING TRANSACTIONS IN THE COMMON STOCK 
OFFERED HEREBY, WHETHER OR NOT PARTICIPATING 
IN THE DISTRIBUTION, MAY BE REQUIRED TO 
DELIVER A PROSPECTUS.  THIS IS IN ADDITION                August ___, 1996 
TO THE OBLIGATION OF DEALERS TO DELIVER A 
PROSPECTUS WHEN ACTING AS UNDERWRITERS AND 
WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR 
SUBSCRIPTIONS.

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



                                        
<PAGE>   14

                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

         The expenses relating to the registration of Shares will be borne by
the Company.  Such expenses are estimated to be as follows:

<TABLE>
              <S>                                                                                   <C>
              Securities and Exchange Commission registration fee . . . . . . . . . . . . . .       $   6,598.44
              Accountants' fees and expenses  . . . . . . . . . . . . . . . . . . . . . . . .          15,000.00
              Legal fees and expenses . . . . . . . . . . . . . . . . . . . . . . . . . . . .          10,000.00
              Miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           5,000.00
                                                                                                    ------------
              Total Expenses  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       $  36,598.44
</TABLE>

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

         The Georgia Business Corporation Code permits a corporation to
eliminate or limit the personal liability of a director to the corporation or
its shareholders for monetary damages for breach of duty of care of other duty
as a director, provided that no provision shall eliminate or limit the
liability of a director:  (A) for an appropriation, in violation of his duties,
of any business opportunity of the corporation; (B) for acts or omissions which
involve intentional misconduct or a knowing violation of law; (C) for unlawful
corporate distributions; or (D) for any transaction from which the director
received an improper personal benefit.  This provision pertains only to
breaches of duty by directors in their capacity as directors (and not in any
other corporate capacity, such as officers) and limits liability only for
breaches of fiduciary duties under Georgia corporate law (and not for violation
of other laws, such as the federal securities laws).  The Company's Amended and
Restated Articles of Incorporation (the "Restated Articles") exonerate the
Company's directors from monetary liability to the extent permitted by this
statutory provision.

         The Company's Restated Articles and Amended and Restated Bylaws (the
"Restated Bylaws") also provide that the Company shall 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 (including any action by or in the right of the
Company), by reason of the fact that such person is or was a director or
officer of the Company, or is or was serving at the request of the Company as a
director or officer of another corporation, partnership, joint venture, trust
or other enterprise, against expenses (including reasonable attorneys' fees),
judgments, fines, and amounts paid in settlement actually and reasonably
incurred by such person in connection with such action, suit or proceeding, if
such person acted in good faith and in a manner such person reasonably believed
to be in or not opposed to the best interests of the Company (and with respect
to any criminal action or proceeding, if such person had no reasonable cause to
believe such person's conduct was unlawful), to the maximum extent permitted
by, and in the manner provided by, the Georgia Business Corporation Code.

         Notwithstanding any provisions of the Company's Restated Articles
and Bylaws to the contrary, the Georgia Business Corporation Code provides 
that the Company shall not indemnify a director or officer for any liability 
incurred in a proceeding in which the director is adjudged liable to the 
Company or is subjected to injunctive relief in favor of the Company:  (1) for 
any appropriation, in violation of his duties, of any business opportunity
of the Company; (2) for acts or omissions which involve intentional misconduct
or a knowing violation of law; (3) for unlawful corporate distributions; or (4)
for any transaction from which the director or officer received an improper
personal benefit.

         The officers and directors of the Company are entitled to
indemnification by the Selling Shareholders against any cause of action, loss,
claim, damage or liability to the extent it arises out of or is based upon the
failure of the Selling Shareholder (or his donees, legatees, or pledgees) and
each underwriter to comply with the Prospectus delivery requirements under the
federal securities laws or any applicable state securities laws or upon
<PAGE>   15

any untrue statement or alleged untrue statement or omission or alleged
omission made in this Registration Statement and the Prospectus contained
herein, as the same shall be amended or supplemented, made in reliance upon or
in conformity with written information furnished to the Company by such Selling
Shareholder or such underwriter.

ITEM 16.   LIST OF EXHIBITS.

    The following exhibits are filed as part of, or are incorporated by
reference into, this report on Form S-3:

<TABLE>
<CAPTION>
 Exhibit No.      Description
 -----------      -----------
     <S>          <C>
      4.1         Provisions of  the Amended and Restated Articles of  Incorporation and Amended and Restated
                  Bylaws of the Company defining  rights of the holders of the Common  Stock (Incorporated by
                  reference to Exhibits  3.1, 3.2, 3.3  and 3.4  to the Company's  Registration Statement  on
                  Form S-1)
             
      5.1         Opinion of  Morris, Manning &  Martin, L.L.P. as  to the legality  of the securities  being
                  registered
             
     10.1*        Amended  and Restated  Operating Agreement of  Harbinger NET  Services, LLC dated  June 20,
                  1995 ("HNS")
             
     10.2*        Note and Security Agreement made by the Company to HNS for $6,000,000, dated June 20, 1995
             
     10.3*        HNS Subordinated Convertible Debenture for $3,000,000 due June 20, 2000
             
     10.4*        Amended and  Restated Software  License Agreement between  the Company and  HNS made  as of
                  June 20, 1995 and effective as of May 31, 1995
             
     10.5*        Amended and Restated  System Operation  Agreement between the  Company and HNS  made as  of
                  June 20, 1995 and effective as of May 31, 1995
             
     10.6*        Amended and Restated Development  Agreement between the Company and HNS made as of June 20,
                  1995 and effective as of May 31, 1995
             
     10.7*        Subscription Documents of the Company for the acquisition of 1,428,571 shares of  HNS dated
                  June 20, 1995
             
     10.8*        Subscription Documents of the Company for 4,285,714 shares of HNS dated June 20, 1995
             
     10.9*        Agreement by and among the Company, HNS, and BellSouth Corporation dated June 20, 1995
             
     10.10*       Management Agreement between the Company and HNS dated as of May 31, 1995
             
     10.11*       Westinghouse Communications Order Form between  the Company and Westinghouse Communications
                  dated May 12, 1995
             
     10.12*       Promissory Note  for $3,000,000  payable by  the Company  to NationsBank  of Georgia,  N.A.
                  ("NationsBank") dated May 2, 1995
             
     10.13*       Loan Agreement  between the Company and NationsBank dated as  of August 15, 1994 with First
                  Amendment dated as of May 2, 1995
</TABLE>

<PAGE>   16

<TABLE>
 <S>              <C>

 10.14*           Employment Agreement  between the Company and Mr. James M. Travers effective as of
                  February 1, 1995 with letter from the Company to Mr. Travers dated December 27, 1994

 10.15*           Employment Agreement between the Company and Mr. James C. Davis effective as of January
                  18, 1995

 10.16*           Assignment of Invention and  Patents Thereon (Patent No. 5,367,664) by Texas Instruments,
                  Incorporated ("TI") to the Company dated January 12, 1995 as recorded with United States
                  Patent and Trademark Office on March 13, 1995

 10.17*           U.S. Patent No. 5,367,664 issued November 22, 1994

 10.18*           Assignment of Invention and Patents Thereon (Application No. 07/502,955) by TI to the
                  Company dated January 12, 1995 as recorded with United States Patent and Trademark Office
                  on March 13, 1995

 10.19*           Asset Purchase Agreement between the Company and TI dated as of December 31, 1994**

 10.20*+          Business Financial Management System License Agreement between the Company and Private
                  Business, Inc. dated December 28, 1994

 10.21*           Employment Agreement between the Company and Mr. David A. Meeker effective as of December
                  21, 1994

 10.22*           Exclusive Licensing Agreement between the Company and Tools & Techniques, Inc. ("T&T")
                  dated as of October 31, 1994

 10.23*           Right-To-Purchase  Agreement between the Company and the Principal Shareholders of T&T
                  dated as of October 31, 1994

 10.24*           401(k) Profit Sharing Plan amended and restated effective as of September 1, 1994;
                  original effective date October 1, 1991

 10.25*           Employment Agreement between the Company and Mr. C. Tycho Howle effective as of March  7,
                  1994

 10.26*           Employment Agreement between the Company and Mr. Joel G. Katz effective as of March 7,
                  1994

 10.27*           Employment Agreement between the Company and Mr. David T. Leach effective as of March 7,
                  1994

 10.28*           Employment Agreement between the Company and Mr. George S. Hart effective as of March 7,
                  1994

 10.29*+          License and Service Agreement between the Company and Bank of America National Trust and
                  Savings Association dated as of February 18, 1994

 10.30*           Harbinger NV. ("HNV") Shareholders Agreement between the Company, AXA Equity & Law Life
                  Assurance Society, Ltd. ("Equity &  Law") and Vulcan  Ventures, Inc. ("Vulcan") dated
                  November 5, 1993 with Addendum made as of May 11,1994

 10.31*           Management Agreement between the Company and Harbinger NV dated as of November 5, 1993
</TABLE>

<PAGE>   17

<TABLE>
 <S>              <C>
 10.32*           Agreement between the Company and EDI Solutions, Inc. effective as of September 1, 1993

 10.33*           Amended and Restated 1993 Stock Option Plan for Nonemployee Directors effective as of
                  August 11, 1993

 10.34*           Co-Marketing Agreement between the Company and Sprint Communications Company Limited
                  Partnership of Delaware made as of August 9, 1993

 10.35*           Series C Preferred Stock Agreement between the Company and Equity & Law dated March 4,
                  1993

 10.36*           Series C Preferred Stock Agreement between the Company and Vulcan dated March 4, 1993

 10.37*           Form of Series B Preferred Stock Agreement by and among the Company and holders of the
                  Series B Preferred Stock of the Company made as of November 30, 1992

 10.38*           Lease between the Company and Lenox Park Development No. 1 L.P. for office located at 1055
                  Lenox Park Boulevard, Atlanta, Georgia dated July 16, 1992 with First Amendment dated July
                  22, 1993 and Second Amendment dated December 27, 1993

 10.39*           Amended and Restated 1989 Stock Option Plan effective as of April 15, 1992

 10.40*+          Harbinger Business Financial Management System License Agreement between the Company as
                  assignee of Harbinger Computer Services, Inc. and Barnett Banks, Inc. dated November 18,
                  1991 with amendment dated May 21, 1992

 10.41*           Software License and Distribution Agreement between the Company and Sprint International
                  Communications Corporation ("Sprint") effective July 27, 1990 with First Amendment
                  effective as of May 24, 1993

 10.42*           Reseller Agreement (now known as Service Management Agreement) between the Company and
                  Sprint effective July 27, 1990 with First Amendment effective as of May 1, 1991, Second
                  Amendment effective as of May 1, 1992, and Third Amendment dated July 1, 1994

 10.43*           Form of Indemnification Agreement between the Company and Directors

 10.44**          Letter Agreement between the Company and Harbinger NET Services, L.L.C.

 10.45**          Subscription Agreement between the Company and Harbinger NV effective December 29, 1995

 10.46**          Subscription Agreement and Investor Suitability  Representations (Regulation S) between the
                  Company and Henk P.M. Kivits effective August 22, 1995

 10.47**          Harbinger NV Amended and Restated Shareholders Agreement between the Company, AXA Equity &
                  Law Life Assurance Society, Ltd. and Vulcan Ventures dated December 29, 1995

 10.48**          Harbinger Corporation 1996 Stock Option Plan

 10.49**          Amended and Restated Harbinger Corporation Employee Stock Purchase Plan

 10.50**          First Amendment to Harbinger Corporation Amended and Restated 1989 Stock Option Plan
                                                                                                      
</TABLE>
<PAGE>   18

<TABLE>
      <S>         <C>
      10.51**     First Amendment to Alliance Agreement between System Software Associates, Inc. and
                  Harbinger Corporation

      10.52**     Supplemental Agreement by and among Harbinger N.V., Harbinger Corporation, Vulcan
                  Ventures, Inc. and AXA Equity & Law Assurance Society, Ltd. effective December 29, 1995

      10.53       Second Amendment to Alliance Agreement between the Company and System Software Associates,
                  Inc. dated August 26, 1996

      10.54       Escrow Agreement by and among the Company, System Software Associates, Inc. and Finley,
                  Colmar and Company dated August 26, 1996

       23.1       Consent of KPMG Peat Marwick LLP
                  
       23.2       Consent of Arthur Andersen LLP
                  
       23.3       Consent of Moret Ernst & Young Accountants
                  
       23.4       Consent of KPMG Deutsche Truehand-Gesellschaft
                  
       23.5       Consent of KPMG Accountants N.V.
                  
       23.6       Consent of Morris, Manning & Martin, L.L.P. (included in Exhibit 5)
                  
       24.1       Power of Attorney (included at Page II-4 of this Registration Statement)
</TABLE>

____________
*   Incorporated by reference to Exhibits filed in response to Item 16(a),
    "Exhibits" of the Company's Registration Statement on Form S-1 (File No.
    33-93804) declared effective on August 22, 1995.
**  Incorporated by reference to Exhibits filed in response to Item 14(c) of
    the Company's Annual Report on Form 10-K for the year ended December 31,
    1995.
+   The Company has received confidential treatment with respect to portions of
    these Exhibits.

ITEM 17.  UNDERTAKINGS.

         The undersigned Registrant hereby undertakes:

         (1)     To file, during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement.

                 (i)      To include in 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 this 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 this
Registration Statement.  Notwithstanding the foregoing, any increase or
decrease in volume of securities offered (if the total dollar value of
securities offered would not exceed that which was registered) and any
deviation from the low or high end of the estimated maximum offering range may
be reflected in the form of prospectus filed with the Commission pursuant to
Rule 424(b) if, in the aggregate, the changes in volume and price represent no
more than a 20% change in the maximum offering price set forth in the
"Calculation of Registration Fee" table in the effective registration
statement;
<PAGE>   19

                 (iii)    To include any material information with respect to
the plan of distribution not previously disclosed in this Registration
Statement or any material change to such information in this Registration
Statement;

provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if the
information required to be included in a post-effective amendment by those
paragraphs is contained in periodic reports filed by the Company pursuant to
Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended
(the "Exchange Act") that are incorporated by reference in this 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.

         (4)     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.
<PAGE>   20

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in the City of Atlanta, State of Georgia on the 26th day of
August, 1996.

                                             HARBINGER CORPORATION
                                           
                                           
                                             By: /s/ C. Tycho Howle     
                                                 -------------------------------
                                                 C. Tycho Howle
                                                 Chairman of the Board and 
                                                 Chief Executive Officer

                               POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints C.  Tycho Howle and/or Joel G. Katz,
jointly and severally, as his true and lawful attorneys-in-fact and agent, with
full power of substitution and resubstitution, for him and in his name, place
and stead, in any and all capacities, to sign a Registration Statement relating
to the registration of shares of common stock on Form S-3 and to sign any and
all amendments (including post effective amendments) to the Registration
Statement, and to file the same, with all exhibits thereto and other documents
in connection therewith, with the 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 required or necessary to be done in
and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents, or any of them, or their or his substitute, could
lawfully do or cause to be done by virtue hereof.

         Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.

<TABLE>
<S>                                        <C>                                                <C>
/s/ C. Tycho Howle                         Chairman of the Board of Directors                 August 27, 1996
- ----------------------------------         and Chief Executive Officer                                               
C. Tycho Howle                             (Principal Executive Officer)
                                           

/s/ David T. Leach                         President, Chief Operating Officer                 August 27, 1996
- ----------------------------------         and Director                                                              
David T. Leach                             

/s/ Joel G. Katz                           Vice President - Finance and Secretary             August 27, 1996
- ----------------------------------         (Principal Financial Officer and Principal               
Joel G. Katz                               Accounting Officer)
                                           

/s/ William D. Savoy                       Director                                           August 27, 1996
- ----------------------------------                                                                                   
William D. Savoy

/s/ William B. King                        Director                                           August 27, 1996
- ----------------------------------                                                                                   
William B. King

/s/ Stuart L. Bell                         Director                                           August 27, 1996
- ----------------------------------                                                                          
Stuart L. Bell

/s/ Roger E. Covey                         Director                                           August 27, 1996
- ----------------------------------                                                                                   
Roger E. Covey

/s/ Henk P.M. Kivits                       Director                                           August 27, 1996
- ----------------------------------                                                                                   
Henk P.M. Kivits
</TABLE>

<PAGE>   21

                                 EXHIBIT INDEX

         The following exhibits are filed with or incorporated by reference
into this Registration Statement pursuant to Item 601 of Regulation S-K:

<TABLE>
<CAPTION>
  Exhibit No.       Description                                                         Sequential Page Number
  -----------       -----------                                                         ----------------------
    <S>             <C>                                                                         <C>
     4.1            Provisions of the Amended and Restated Articles of
                    Incorporation and Amended and Restated Bylaws of the Company
                    defining rights of the holders of the Common Stock
                    (Incorporated by reference to Exhibits 3.1, 3.2, 3.3 and 3.4 to
                    the Company's Registration Statement on Form S-1)                           N/A

     5.1            Opinion of Morris, Manning  & Martin, L.L.P. as to the legality
                    of the securities being registered

    10.1*           Amended and Restated Operating Agreement of Harbinger NET                   
                    Services, LLC dated June 20, 1995 ("HNS")                                   N/A

    10.2*           Note and Security Agreement made by the Company to HNS for                 
                    $6,000,000, dated June 20, 1995                                             N/A

    10.3*           HNS Subordinated Convertible Debenture for $3,000,000 due June             
                    20, 2000                                                                    N/A

    10.4*           Amended and Restated Software License Agreement between the
                    Company and HNS made as of June 20, 1995 and effective as of               
                    May 31, 1995                                                                N/A

    10.5*           Amended and Restated System Operation Agreement between the
                    Company and HNS made as of June 20, 1995 and effective as of           
                    May 31, 1995                                                                N/A

    10.6*           Amended and Restated Development Agreement between the Company
                    and HNS made as of June 20, 1995 and effective as of May 31,           
                    1995                                                                        N/A

    10.7*           Subscription Documents of the Company for the acquisition  of
                    1,428,571 shares of HNS dated June 20, 1995                                 N/A

    10.8*           Subscription Documents of the Company for 4,285,714 shares of
                    HNS dated June 20, 1995                                                     N/A

    10.9*           Agreement by and among the Company, HNS, and BellSouth
                    Corporation dated June 20, 1995                                             N/A

    10.10*          Management Agreement between the Company and HNS dated as of
                    May 31, 1995                                                                N/A

    10.11*          Westinghouse Communications Order Form between the Company and
                    Westinghouse Communications dated May 12, 1995                              N/A
</TABLE>

<PAGE>   22

<TABLE>
            <S>             <C>                                                                         <C>
            10.12*          Promissory Note for $3,000,000 payable by the Company to
                            NationsBank of Georgia, N.A. ("NationsBank") dated May  2,                  
                            1995                                                                        N/A

            10.13*          Loan Agreement between the Company and NationsBank dated as of
                            August 15, 1994 with First Amendment dated as of May 2, 1995                N/A

            10.14*          Employment Agreement between the Company and Mr. James M.
                            Travers effective as of February 1, 1995 with letter from the               
                            Company to Mr. Travers dated December 27, 1994                              N/A

            10.15*          Employment Agreement between the Company and Mr. James C. Davis
                            effective as of January 18, 1995                                            N/A

            10.16*          Assignment of Invention and Patents Thereon (Patent No.
                            5,367,664) by Texas Instruments, Incorporated ("TI") to the              
                            Company dated January 12, 1995 as recorded with United States
                            Patent and Trademark Office on March 13, 1995                               N/A

            10.17*          U.S. Patent No. 5,367,664 issued November 22, 1994
                                                                                                        N/A
            10.18*          Assignment of Invention and Patents Thereon (Application No.
                            07/502,955) by TI to the Company dated January 12, 1995 as                  
                            recorded with United States Patent and Trademark Office on
                            March 13, 1995                                                              N/A

            10.19*          Asset Purchase Agreement between the Company and TI dated as of
                            December 31, 1994                                                           N/A

            10.20*+         Business Financial Management System License Agreement between
                            the Company and Private Business, Inc. dated December 28, 1994              N/A

            10.21*          Employment Agreement between the Company and Mr. David A.
                            Meeker effective as of December 21, 1994                                    N/A

            10.22*          Exclusive Licensing Agreement between the Company and Tools &
                            Techniques, Inc. ("T&T") dated as of October 31, 1994                       N/A

            10.23*          Right-To-Purchase Agreement between the Company and the
                            Principal Shareholders of T&T dated as of October 31, 1994                  N/A

            10.24*          401(k) Profit Sharing Plan amended and restated effective as of
                            September 1, 1994; original effective date October 1, 1991                  N/A

            10.25*          Employment Agreement between the Company and Mr. C. Tycho Howle
                            effective as of March 7, 1994                                               N/A

            10.26*          Employment Agreement between the Company and Mr. Joel G. Katz
                            effective as of March 7, 1994                                               N/A

            10.27*          Employment Agreement between the Company and Mr. David T. Leach
                            effective as of March 7, 1994                                               N/A


</TABLE>



                                      -2-
<PAGE>   23

<TABLE>
            <S>             <C>                                                                         <C>
            10.28*          Employment Agreement between the Company and Mr. George S. Hart
                            effective as of March 7, 1994                                               N/A

            10.29*+         License and Service Agreement between the Company and Bank of
                            America National Trust and Savings Association dated as of            
                            February 18, 1994                                                           N/A

            10.30*          Harbinger NV. ("HNV") Shareholders Agreement between the
                            Company, AXA Equity & Law Life Assurance Society, Ltd.            
                            ("Equity & Law") and Vulcan Ventures, Inc. ("Vulcan") dated
                            November 5, 1993 with Addendum made as of May 11, 1994                      N/A

            10.31*          Management Agreement between the Company and Harbinger NV dated
                            as of November 5, 1993                                                      N/A

            10.32*          Agreement between the Company and EDI Solutions, Inc. effective
                            as of September 1, 1993                                                     N/A

            10.33*          Amended and Restated 1993 Stock Option Plan for Nonemployee
                            Directors effective as of August 11, 1993                                   N/A

            10.34*          Co-Marketing Agreement between the Company and Sprint
                            Communications Company Limited Partnership of Delaware made as            
                            of August 9, 1993                                                           N/A

            10.35*          Series C Preferred Stock Agreement between the Company and
                            Equity & Law dated March 4, 1993                                            N/A

            10.36*          Series C Preferred Stock Agreement between the Company and
                            Vulcan dated March 4, 1993                                                  N/A

            10.37*          Form of Series B Preferred Stock Agreement by and among the
                            Company and holders of the Series B Preferred Stock of the            
                            Company made as of November 30, 1992                                        N/A

            10.38*          Lease between the Company and Lenox Park Development No. 1 L.P.
                            for office located at 1055 Lenox Park Boulevard, Atlanta,            
                            Georgia dated July 16, 1992 with First Amendment dated July 22,
                            1993 and Second Amendment dated December 27, 1993                           N/A

            10.39*          Amended and Restated 1989 Stock Option Plan effective as of
                            April 15, 1992                                                              N/A

            10.40*+         Harbinger Business Financial Management System License
                            Agreement between the Company as assignee of Harbinger Computer          
                            Services, Inc. and Barnett Banks, Inc. dated November 18, 1991
                            with amendment dated May 21, 1992                                           N/A

            10.41*          Software License and Distribution Agreement between the Company
                            and Sprint International Communications Corporation                        
                            ("Sprint") effective July 27, 1990 with First Amendment
                            effective as of May 24, 1993                                                N/A

</TABLE>




                                      -3-
<PAGE>   24

<TABLE>
            <S>             <C>                                                                         <C>
            10.42*          Reseller Agreement (now known as Service Management Agreement)
                            between the Company and Sprint effective July 27, 1990 with                    
                            First Amendment effective as of May 1, 1991, Second Amendment
                            effective as of May 1, 1992, and Third Amendment dated July 1,
                            1994                                                                        N/A

            10.43*          Form of Indemnification Agreement between the Company and
                            Directors                                                                   N/A

            10.44**         Letter Agreement between the Company and Harbinger NET
                            Services, L.L.C.                                                            N/A

            10.45**         Subscription Agreement between the Company and Harbinger NV
                            effective December 29, 1995                                                 N/A

            10.46**         Subscription Agreement and Investor Suitability Representations
                            (Regulation S) between the Company and Henk P.M. Kivits               
                            effective August 22, 1995                                                   N/A

            10.47**         Harbinger NV Amended and Restated Shareholders Agreement
                            between the Company, AXA Equity & Law Life Assurance Society,                   
                            Ltd. and Vulcan Ventures dated December 29, 1995                            N/A

            10.48**         Harbinger Corporation 1996 Stock Option Plan                                N/A
                                                                                                           
            10.49**         Amended and Restated Harbinger Corporation Employee Stock
                            Purchase Plan                                                               N/A

            10.50**         First Amendment to Harbinger Corporation Amended and Restated
                            1989 Stock Option Plan                                                      N/A

            10.51**         First Amendment to Alliance Agreement between System Software
                            Associates, Inc. and Harbinger Corporation                                  N/A

            10.52**         Supplemental Agreement by and among Harbinger N.V., Harbinger
                            Corporation, Vulcan Ventures, Inc. and  AXA Equity & Law                    
                            Assurance Society, Ltd. effective December 29, 1995                         N/A

            10.53           Second Amendment to Alliance Agreement between the Company and
                            System Software Associates, Inc. dated August 26, 1996

            10.54           Escrow  Agreement by and among the Company, System Software
                            Associates, Inc. and Finley, Colmar and Company dated August
                            26, 1996

             23.1           Consent of KPMG Peat Marwick LLP

             23.2           Consent of Arthur Andersen LLP

             23.3           Consent of Moret Ernst & Young Accountants

</TABLE>



                                      -4-
<PAGE>   25

<TABLE>
      <S>        <C>                                                                         <C>
      23.4       Consent of KPMG Deutsche Truehand-Gesellschaft
      
      23.5       Consent of KPMG Accountants N.V.
      
      23.6       Consent of Morris, Manning & Martin, L.L.P. (included in                   
                 Exhibit 5)                                                                  N/A
      
      24.1       Power of Attorney (included at Page II-4 of this Registration
                 Statement)                                                                  N/A
</TABLE>
____________
*   Incorporated by reference to Exhibits filed in response to Item 16(a),
    "Exhibits" of the Company's Registration Statement on Form S-1 (File No.
    33-93804) declared effective on August 22, 1995.
**  Incorporated by reference to Exhibits filed in response to Item 14(c) of
    the Company's Annual Report on Form 10-K for the year ended December 31,
    1995.
+   The Company has received confidential treatment with respect to portions of
    these Exhibits.





                                      -5-

<PAGE>   1

                                                                     EXHIBIT 5.1

                  Opinion of Morris, Manning & Martin, L.L.P.
<PAGE>   2

                                August 23, 1996


Harbinger Corporation
1055 Lenox Park Blvd.
Atlanta, Georgia  30319

         Re:     Registration Statement on Form S-3

Gentlemen:

         We have acted as counsel for Harbinger Corporation, a Georgia
corporation (the "Company"), in connection with the registration under the
Securities Act of 1933, as amended, pursuant to a Registration Statement on
Form S-3, of a proposed offering of up to 743,125 shares of the Company's
common stock, $.0001 par value per share ("Shares"), by certain shareholders of
the Company.

         We have examined such documents, corporate records, and other
instruments as we have considered necessary and advisable for purposes of
rendering this opinion.  Based upon and subject to the foregoing, we are of the
opinion that the Shares have been duly authorized and validly issued, and are
fully paid and nonassessable.

         This opinion is limited by and is in accordance with, the January 1,
1992, edition of the Interpretive Standards applicable to Legal Opinions to
Third Parties in Corporate Transactions adopted by the Legal Opinion Committee
of the Corporate and Banking Law Section of the State Bar of Georgia.

         We hereby consent to the filing of this Opinion as an exhibit to the
Company's registration statement on Form S-3 and to the reference to our firm
under the caption "Legal Matters" in the Prospectus contained in the
Registration Statement.


                                                Very truly yours,


                                                MORRIS, MANNING & MARTIN, L.L.P.


                                                /s/ Larry W. Shackelford
                                                ------------------------
                                                Larry W. Shackelford

<PAGE>   1

                                                                   EXHIBIT 10.53

                     Second Amendment to Alliance Agreement
<PAGE>   2

                     SECOND AMENDMENT TO ALLIANCE AGREEMENT

         This SECOND AMENDMENT (this "Amendment") dated the 26th day of August,
1996 and effective as of August 26, 1996 (the "Effective Date"), is between
HARBINGER CORPORATION (hereinafter "Harbinger") and SYSTEM SOFTWARE ASSOCIATES,
INC.  (hereinafter "SSA").  This Second Amendment amends and revises the
Alliance Agreement between Harbinger and SSA made as of July 21, 1995 as
modified by the First Amendment to Alliance Agreement effective as of July 21,
1995 (collectively, the "Agreement" or "Alliance Agreement").  Capitalized
terms not defined herein shall have the meaning assigned to them in the
Agreement.

         Background.

         A.      The parties have previously entered into an Alliance Agreement
dated July 21, 1995, as modified by the First Amendment effective July 21,
1995.

         B.      Under Section 3.A.(xv) of the Alliance Agreement, SSA has been
granted registration rights covering certain shares of Harbinger Common Stock,
including two (2) demand registrations.

         C.      Section 6.C of the Alliance Agreement sets forth the following
Minimum Royalties to be paid by SSA to Harbinger: First Annual Minimum of
$1,381,718 due January 1, 1996; Second Annual Minimum of $5,741,271 due January
1, 1997; and Final Annual Minimum of $99,011 due January 31, 1997.

         D.      As of the Effective Date, SSA had paid in full to Harbinger
the First Annual Minimum.

         For good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties agree as follows:

         1.      In consideration for this Second Amendment, Harbinger will
                 allow SSA to exercise one of the registration rights as of the
                 Effective Date.

         2.      The existing Alliance Agreement contains errors in the
                 internal section references.  Section 3.B does not exist.  All
                 cross references and internal references in the Alliance
                 Agreement to Section 3.B.(xv) or Section 3(xv) are hereby
                 revised to Section 3.A.(xv).

         3.      Registration Rights.  SSA shall be entitled to register
                 550,000 shares of Harbinger Common Stock (the "Registered
                 Shares") in accordance to Section 3.A.(xv) of the Alliance
                 Agreement.  SSA's registration of such Shares (the
                 "Registration") will constitute the one (1) occasion and SSA
                 will have one (1) remaining occasion to exercise its
                 registration rights as set forth in Section 3.A.(xv).  Any
                 exercise of the second occasion will be subject to the terms
                 and conditions of the Alliance Agreement.  This Second
                 Amendment shall not be construed in any way to waive the
                 obligations and conditions to the exercise of the second
                 occasion.
<PAGE>   3


         4.      Escrow.  Within five (5) days from the effective date  of the
                 Registration, SSA shall transfer 275,000 of the Registered
                 Shares (the "Escrowed Shares") to the Escrow Agent along with
                 appropriate stock powers and powers of attorney and other
                 documents as may be reasonably requested by Escrow Agent, in
                 accordance with the attached Escrow Agreement.

         5.      Sale of Escrowed Shares.  During the period of effectiveness
                 of a registration statement covering the sale of the Escrowed
                 Shares, SSA may sell those Shares at any time during the term
                 of the Agreement in accordance with the terms of the Escrow
                 Agreement.

                 In addition, SSA agrees and hereby authorizes the Escrow Agent
                 to sell the Escrowed Shares under the following conditions in
                 accordance with the terms of the Escrow Agreement:

                          (i)     In the event that SSA has not paid the Second
                 Annual Minimum in full to Harbinger by January 1, 1997; and/or

                          (ii)    In the event that SSA has not paid the Final
                 Annual Minimum in full to Harbinger by January 31, 1997.

         6.      Proceeds.        Proceeds from the sale of the Escrowed Shares
                 will be applied toward the Minimum Royalties as set forth in
                 Section 6.C. of the Alliance Agreement and shall be
                 distributed by Escrow Agent to Harbinger and SSA in accordance
                 with the terms of the Escrow Agreement.

         7.      General.         Nothing in this Second Amendment (i) waives
                 or amends any of SSA's or Harbinger's obligations under the
                 Alliance Agreement, or (ii) shall be construed to alter any
                 payment obligations under the Alliance Agreement, including
                 but not limited to the obligations to make Minimum Royalty
                 payments, and the parties acknowledge that all of SSA's
                 obligation with respect to Minimum Royalties shall continue in
                 full force and effect in accordance with the Alliance
                 Agreement.

                 Except as set forth above, the terms and conditions of the
                 Alliance Agreement remain in full force and effect.  Upon
                 execution by all parties hereto, this Second Amendment shall
                 be attached to and form a part of the Agreement.  This Second
                 Amendment may be executed in counterparts, all of which when
                 taken together shall constitute the full and binding agreement
                 of the parties.



SYSTEM SOFTWARE ASSOCIATES, INC.               HARBINGER CORPORATION          
                                                                              
                                                                              
- --------------------------------------         -------------------------------
Signature                                      Signature                      
                                                                              
                                                
- --------------------------------------         -------------------------------
Title                             Date         Title                      Date
                                                                              





                                      -2-

<PAGE>   1

                                                                   EXHIBIT 10.54

                                Escrow Agreement
<PAGE>   2

                                ESCROW AGREEMENT


         THIS ESCROW AGREEMENT (the "Agreement") is entered into and effective
as of the 26th day of August, 1996, by and among HARBINGER CORPORATION
(hereinafter "Harbinger"), SYSTEM SOFTWARE ASSOCIATES, INC. (hereinafter
"SSA"), and FINLEY, COLMER AND COMPANY (hereinafter "Escrow Agent").

                                   BACKGROUND

         Harbinger and SSA have entered into an Alliance Agreement dated July
21, 1995 and related First and Second Amendments (collectively, the "Alliance
Agreement").  Harbinger and SSA desire to establish an escrow for the shares of
Harbinger stock (the "Escrowed Shares") as provided under the Second Amendment
to the Alliance Agreement, and the Escrow Agent is willing to serve as Escrow
Agent upon the terms and conditions set forth herein.

         In consideration of the premises and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
the parties hereto agree as follows:

         1.      DEPOSIT WITH ESCROW AGENT.  In accordance with the Second
Amendment to the Alliance Agreement, SSA shall transfer the Escrowed Shares to
the Escrow Agent along with appropriate stock powers and powers of attorney,
and other documents as may be reasonably requested by Escrow Agent.  The Escrow
Agent agrees that it will accept, in its capacity as escrow agent, the Escrowed
Shares received by it from SSA and any Escrowed Funds received by it.

         2.      DISTRIBUTION OF ESCROWED SHARES AND ESCROWED FUNDS.

         (a)     The Escrow Agent shall distribute the Escrowed Shares and
Escrowed Funds in the amounts, at the times, and upon the following conditions
as set forth in the attached EXHIBIT A.

         (b)     All sales of the Escrowed Shares initiated in accordance with
this Agreement shall be transacted through Alex. Brown & Sons, Inc. or such
other firm as selected by SSA and reasonably acceptable to Harbinger (the
"Broker").  SSA agrees to execute and deliver any and all other documents as
may be reasonably requested by Broker for Broker to sell the Escrowed Shares as
set forth herein.

         (c)     If all Minimum Royalties due under the Alliance Agreement have
been fully paid on or prior to January 31, 1997, the Escrow Agent shall return
the remaining Escrowed Shares and Escrowed Funds in its possession to SSA.

         (d)     Notwithstanding anything to the contrary in this Agreement,
under no circumstances will the Escrowed Shares be transferred to Harbinger.
<PAGE>   3


         3.      DISTRIBUTION OF DIVIDENDS.  Any dividends earned on the
Escrowed Shares shall be applied toward the Minimum Royalties in the same
manner as the proceeds of the sale of the Escrowed Shares as set forth herein.

         4.      INVESTMENT OF ESCROWED FUNDS.  The Escrow Agent shall invest
any funds, including the proceeds of any sales of the Escrowed Shares or
dividends paid thereon (the "Escrowed Funds"), not yet paid to either Harbinger
or SSA pursuant to the terms of this Agreement in deposit accounts or
short-term certificates of deposit which are fully insured by the Federal
Deposit Insurance Corporation or another agency of the United States
government, short-term securities issued or fully guaranteed by the United
States government or money market funds investing only in securities issued or
fully guaranteed by the United States government.  SSA shall provide the Escrow
Agent with instructions from time to time concerning in which of the specific
investment instruments described above the Escrowed Funds shall be invested,
and the Escrow Agent shall adhere to such instructions.

         5.      FEES OF ESCROW AGENT.  SSA shall pay the Escrow Agent a fee of
Two thousand five hundred Dollars ($2,500.00) for its services hereunder,
payable upon transfer of the Escrowed Shares to the Escrow Agent, and such
other reasonable fees and expenses associated with establishment of this escrow
arrangement.  SSA shall also pay any commissions or expenses associated with
the sale of any of the Escrowed Shares.

         6.      LIABILITY OF ESCROW AGENT.

         (a)     In performing any of its duties under this Agreement, or upon
the claimed failure to perform its duties hereunder, the Escrow Agent shall not
be liable to anyone for any damages, losses or expenses which it may incur as a
result of the Escrow Agent so acting, or failing to act; provided, however, the
Escrow Agent shall be liable for damages arising out of its willful default or
misconduct or its gross negligence under this Agreement.  Accordingly, the
Escrow Agent shall not incur any such liability with respect to (i) any action
taken or omitted to be taken in good faith upon advice of its counsel which is
given with respect to any questions relating to the duties and responsibilities
of the Escrow Agent hereunder; or (ii) any action taken or omitted to be taken
in reliance upon any document, including any written notice or instructions
provided for this Escrow Agreement, not only as to its due execution and to the
validity and effectiveness of its provisions but also as to the truth and
accuracy of any information contained therein, if the Escrow Agent shall in
good faith believe such document to be genuine, to have been signed or
presented by a proper person or persons, and to conform with the provisions of
this Agreement.

         (b)     The other parties hereto agree to jointly and severally
indemnify and hold harmless the Escrow Agent against any and all losses,
claims, damages, liabilities and expenses, including, without limitation,
reasonable costs of investigation and counsel fees and disbursements which may
be imposed by the Escrow Agent or incurred by it in connection with its
acceptance of this appointment as Escrow Agent hereunder or the performance of
its duties hereunder, including, without limitation, any litigation arising
from this Escrow Agreement or involving the subject matter thereof; except,
that if the Escrow Agent shall be found guilty of





                                      -2-
<PAGE>   4

willful misconduct or gross negligence under this Agreement, then, in that
event, the Escrow Agent shall bear all such losses, claims, damages and
expenses.

         (c)     If a dispute ensues between any of the parties hereto which,
in the opinion of the Escrow Agent, is sufficient to justify its doing so, the
Escrow Agent shall retain legal counsel of its choice as it reasonably may deem
necessary to advise it concerning its obligations hereunder and to represent it
in any litigation to which it may be a part by reason of this Agreement. The
Escrow Agent shall be entitled to tender into the registry or custody of any
court of competent jurisdiction all money or property in its hands under the
terms of this Agreement, and to file such legal proceedings as it deems
appropriate, and shall thereupon be discharged from all further duties under
this Agreement.  Any such legal action may be brought in any such court as the
Escrow Agent shall determine to have jurisdiction thereof.  In connection with
such dispute, other parties shall jointly and severally indemnify the Escrow
Agent against its court costs and reasonable attorney's fees and expenses
incurred.

         (d)     The Escrow Agent may resign at any time upon giving thirty
(30) days written notice to SSA and Harbinger.  If a successor escrow agent
reasonably acceptable to Harbinger is not appointed by SSA within thirty (30)
days after notice of resignation, the Escrow Agent may petition any court of
competent jurisdiction to name a successor escrow agent and the Escrow Agent
herein shall be fully relieved of all liability under this Agreement to any and
all parties upon the transfer of the Escrowed Shares and all related
documentation thereto, including appropriate information to assist the
successor escrow agent appointed by the court.

         7.      APPOINTMENT OF SUCCESSOR.  SSA may, upon the delivery of
thirty (30) days written notice executed by SSA, appointing a successor escrow
agent to the Escrow Agent (provided such successor agent shall be reasonably
acceptable to Harbinger), terminate the services of the Escrow Agent hereunder.
In the event of such termination, the Escrow Agent shall immediately deliver to
the successor escrow agent, all Escrowed Shares and Escrowed Funds in its
possession, less any fees and expenses due to the Escrow Agent or required to
be paid by the Escrow Agent to a third party pursuant to this Agreement.

         8.      NOTICE.  All notices, requests, demands and other
communications or deliveries required or permitted to be given hereunder shall
be in writing and shall be deemed to have been duly given three days after
having been deposited for mailing if sent by registered mail, or certified mail
return receipt requested, or delivery by courier, to the respective addresses
set forth below:


         IF TO HARBINGER:
                                                 Harbinger Corporation
                                                 1055 Lenox Park Boulevard
                                                 Atlanta, Georgia 30319
                                                 Attn.: Joel Katz
                                                       Phone: (404) 841-4334
                                                       Fax: (404) 841-4316





                                      -3-
<PAGE>   5


         IF TO SSA:                     System Software Associates, Inc.
                                        500 West Madison
                                        Chicago, Illinois 60661
                                        Attn.: Joe Skadra
                                              Phone: (312) 258-6157
                                              Fax: (312) 474-7500
                                        
         IF TO THE ESCROW AGENT:        
                                        Finley, Colmer and Company
                                        115 Perimeter Center Place, Suite 640
                                        Atlanta, Georgia 30346
                                        Attn.: Peter Colmer
                                              Phone: (770) 668-0637
                                              Fax: (770) 668-0641

         9.      DISPUTE RESOLUTION AND ARBITRATION.  In the event of a dispute
between SSA and Harbinger under this Agreement, including but not limited to a
dispute over the amount of Minimum Royalties due and/or payable, the parties
shall first submit the dispute for resolution by the CFOs (or comparable
position) of each party.  If these persons do not satisfactorily resolve the
dispute within twenty-four (24) hours of such submission, then the CEOs (or
comparable position) of each party shall attempt to resolve it.  If the dispute
is not resolved by these persons within twenty-four (24) hours of submission to
them (or such longer period of time as the CEOs may mutually agree), both
parties agree to submit the dispute to binding arbitration.  In such case, both
parties agree to the appointment of one (1) arbitrator selected by the American
Arbitration Association ("AAA").  The arbitration shall be conducted in
Atlanta, Georgia in accordance with the rules, regulations and procedures of
the AAA, and the decision of the arbitrator shall be final and binding on both
parties.  SSA and Harbinger shall equally bear the costs of such arbitration.

         10.     GENERAL.

         (a)     This Agreement shall be governed by and construed and enforced
in accordance with the laws of the State of Georgia.

         (b)     The section headings contained herein are for reference
purposes only and shall not in any way affect the meaning or interpretation of
this Agreement.

         (c)     This Agreement and the Alliance Agreement set forth the entire
agreement and understanding of the parties with regard to this escrow
transaction and supersedes all prior agreements, arrangements and
understandings relating to the subject matter hereof.

         (d)     This Agreement may be amended, modified, superseded or
canceled, and any of the terms or conditions hereof may be waived, only by a
written instrument executed by each party hereto or, in the case of a waiver,
by the party waiving compliance.  The failure of any part at any time or times
to require performance of any provision hereof shall in no manner affect the
right at a later time to enforce the same.  Time is of the essence of this
Agreement.  No waiver in





                                      -4-
<PAGE>   6

any one or more instances by any part of any condition, or of the breach of any
term contained in this Agreement, whether by conduct or otherwise, shall be
deemed to be, or construed as, a further or continuing waiver of any such
condition or breach, or a waiver of any other condition or of the breach of any
other terms of this Agreement.

         (e)     This Agreement may be executed simultaneously in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.

         (f)     This Agreement shall inure to the benefit of the parties
hereto and their respective administrators, successors and assigns.  The Escrow
Agent shall be bound only by the terms of this Escrow Agreement and shall not
be bound by or incur any liability with respect to any other agreement or
understanding between the parties except as herein expressly provided.  The
Escrow Agent shall not have any duties hereunder except those specifically set
forth herein.

         (g)     No interest in any part to this Agreement shall be assignable
in the absence of a written agreement by and between all the parties to this
Agreement, executed with the same formalities as this original Agreement.


         IN WITNESS WHEREOF, the parties have duly executed this Agreement as
the date first written above.


SSA:                                                                          
                                             HARBINGER:                       
                                                                              
SYSTEM SOFTWARE ASSOCIATES, INC.             HARBINGER CORPORATION            
                                                                              
                                                                              
- --------------------------------             ---------------------------------
Signature                                    Signature                       
                                                                              
                                                                              
- --------------------------------             ---------------------------------
Title                       Date             Title                        Date
                                                                              
                                                                              
ESCROW AGENT:                                                                 
                                                                              
FINLEY, COLMER AND COMPANY                                                    
                                                                              
                                                                              
- --------------------------------
Signature                                                                     
                                                                              
- --------------------------------
Title                       Date                               
                                                                              




                                      -5-
<PAGE>   7

                                   EXHIBIT A

                        DISTRIBUTION OF ESCROWED SHARES


1.       The Minimum Royalties due under the Alliance Agreement are as follows:

<TABLE>
<CAPTION>
                
                
         PERIODS                  AMOUNT           DUE DATE
         -------                  ------           --------
         <S>                      <C>              <C>
         First Annual Minimum:    $1,381,718       due January 1, 1996 (fully paid by SSA)

         Second Annual Minimum:   $5,741,271       due January 1, 1997

         Final Annual Minimum:    $   99,011       due January 31, 1997
</TABLE>

         If at any time the Royalty paid by SSA to Harbinger exceeds the
Minimum for that Period, then the excess in any one Period will be applied to
reduce the Minimum for the next Period as set forth in  Section 6.C. of the
Alliance Agreement.

2.       The Escrow Agent shall sell the Escrowed Shares or an appropriate
portion thereof if so directed by SSA or if required by Section 3 below, and
apply the proceeds of any such sale as provided in Section 3 below.

3.       The proceeds from sale of the Escrowed Shares shall be applied against
the outstanding Minimum Royalties and distributed by Escrow Agent as follows:

         A.      ON OR BEFORE JANUARY 1, 1997

                 If at any time on or prior to January 1, 1997, the Escrow
                 Agent sells any of the Escrowed Shares, the net proceeds from
                 such sale (after deducting brokerage commissions and other
                 expenses) (the "Net Proceeds") shall be distributed as
                 follows:

                          1.      The Escrow Agent shall deduct from the Net
                 Proceeds an amount up to the sum of the Second Annual Minimum
                 and Final Annual Minimum ("Set-Aside Amount") and shall retain
                 such amount for payment to Harbinger as set forth below; and

                          2.      The remainder of the Net Proceeds, if any,
                 shall be distributed to SSA.

         B.      FROM JANUARY 1, 1997 TO JANUARY 30, 1997

                          1.      At any time on or after January 1, 1997,
                 Harbinger shall notify the Escrow Agent and SSA ("Harbinger
                 First Notice") that the Second Annual





                                      -6-
<PAGE>   8

                 Minimum has not been fully paid as of January 1, 1997.
                 Harbinger shall include in such notice: (i) the amount of
                 Second Annual Minimum less any applicable reductions based on
                 royalty payments, if any, made by SSA as specified in the
                 latest Monthly Report ("Monthly Report" as described in
                 Sections 6.B.  and 6.H. of the Alliance Agreement) submitted
                 by SSA to Harbinger as of the Harbinger First Notice date (the
                 "Amount Due"), and (ii) a copy of such Monthly Report.  Within
                 three (3) days after SSA's receipt of the Harbinger First
                 Notice, SSA may notify Escrow Agent and Harbinger in writing
                 of any dispute with the Amount Due.  In the event SSA provides
                 such notice of a dispute within this three (3) day period, the
                 parties shall seek to resolve such dispute in accordance with
                 Section 9 of this Escrow Agreement.

                 In the event that the Escrow Agent has not received a notice
                 of dispute from SSA within the three (3) day period specified
                 herein, the Escrow Agent shall perform the following: (i) the
                 Escrow Agent shall immediately pay to Harbinger such Amount
                 Due out of the Set-Aside Amount, if any; and (ii) in the event
                 that the Set-Aside Amount is less than the Amount Due, the
                 Escrow Agent shall immediately sell as many Escrowed Shares
                 (or if necessary all of them) as needed to result in the Net
                 Proceeds that, when added to the Set-Aside Amount, equals the
                 Amount Due, and immediately pay such Amount Due to Harbinger;
                 provided the Escrow Agent shall immediately sell all of the
                 remaining Escrowed Shares if the aggregate value of the
                 remaining Escrowed Shares based on the closing price of
                 Harbinger stock on Nasdaq on the third day of the three (3)
                 day period specified above is less than the Amount Due and
                 shall immediately pay the Net Proceeds therefrom to Harbinger,
                 with the balance of any Amount Due remaining an obligation of
                 SSA to Harbinger as set forth in the Alliance Agreement.

                          2.      If at any time from January 1, 1997 to
                 January 30, 1997, Escrow Agent sells any of the Escrowed
                 Shares, then after satisfying the obligations under Section
                 B.1. above, any remaining Net Proceeds from such sale(s) will
                 be distributed as follows:

                                  (i)      Escrow Agent shall deduct from the
                          remaining Net Proceeds an amount that, when added to
                          the remaining Set-Aside Amount, equals the Final
                          Annual Minimum (the "Final Set-Aside") and shall
                          retain such amount for payment to Harbinger as set
                          forth below; and

                                  (ii)     The remainder of the Net Proceeds,
                          if any, shall be distributed to SSA.

         C.      ON OR AFTER JANUARY 31, 1997

                          1.      At any time on or after January 31, 1997,
                 Harbinger shall notify the Escrow Agent and SSA ("Harbinger
                 Second Notice") that the Final Annual Minimum has not been
                 fully paid as of January 31, 1997.  Harbinger shall include





                                      -7-
<PAGE>   9

                 in such notice: (i) the amount of Final Annual Minimum less
                 any applicable reductions based on royalty payments, if any,
                 made by SSA as specified in the latest Monthly Report
                 submitted by SSA to Harbinger as of the Harbinger Second
                 Notice date (the "Final Amount Due"), and (ii) a copy of such
                 Monthly Report. Within three (3) days after SSA's receipt of
                 the Harbinger Second Notice, SSA may notify Escrow Agent and
                 Harbinger in writing of any dispute with the Amount Due.  In
                 the event SSA provides such notice of a dispute within this
                 three (3) day period, the parties shall seek to resolve such
                 dispute in accordance with Section 9 of this Escrow Agreement.

                 In the event that the Escrow Agent has not received a notice
                 of dispute from SSA within the three (3) day period specified
                 herein, the Escrow Agent shall perform the following: (i) the
                 Escrow Agent shall immediately pay to Harbinger such Final
                 Amount Due out of the Final Set-Aside, if any; and (ii) in the
                 event that the Final Set-Aside is less than the Final Amount
                 Due, the Escrow Agent shall sell as many Escrowed Shares as
                 needed to result in the Net Proceeds that, when added to the
                 Final Set-Aside, equals the Final Amount Due, and immediately
                 pay such Final Amount Due to Harbinger; provided the Escrow
                 Agent shall immediately sell all of the remaining Escrowed
                 Shares if the aggregate value of the remaining Escrowed Shares
                 based on the closing price of Harbinger stock on Nasdaq on the
                 third day of the three (3) day period specified above is less
                 than the Final Amount Due and shall immediately pay the Net
                 Proceeds therefrom to Harbinger, with the balance of any Final
                 Amount Due remaining an obligation of SSA to Harbinger as set
                 forth in the Alliance Agreement.

                          The remainder of the Escrowed Shares and/or Net
                 Proceeds, if any, shall be released and/or paid to SSA.





                                      -8-

<PAGE>   1

                                                                    EXHIBIT 23.1



                         INDEPENDENT AUDITORS' CONSENT



The Board of Directors
Harbinger Corporation


We consent to the use of our reports dated February 9, 1996 relating to the
balance sheet of Harbinger Corporation as of December 31, 1995 and the related
statements of operations, shareholders' equity, and cash flows for the year
then ended and the financial statement schedule incorporated by reference in
the Form S-3 Registration Statement of Harbinger Corporation and to the
reference to our firm under the heading of "Experts" in the prospectus.




                                                   /s/ KPMG Peat Marwick LLP  
                                                   ---------------------------
                                                   KPMG Peat Marwick LLP



Atlanta, Georgia
August 23, 1996

<PAGE>   1

                                                                    EXHIBIT 23.2



                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS





As independent public accountants, we hereby consent to the incorporation by
reference in this Form S-3 Registration Statement of our report dated March 14,
1995 included in Harbinger Corporation's report on Form 10-K for the year ended
December 31, 1995 and to all references to our Firm included in this
registration statement.



                                        /s/ Arthur Andersen LLP
                                        -----------------------
                                        Arthur Andersen LLP



Atlanta, Georgia
August 23, 1996

<PAGE>   1

                                                                    EXHIBIT 23.3



                         INDEPENDENT AUDITORS' CONSENT



The Board of Directors
Harbinger Corporation


We consent to the use of our report dated June 14, 1996 relating to the
consolidated balance sheet of NTEX Holding B.V.  as of December 31, 1995, and
the related consolidated statements of operations, shareholders' equity, and
cash flows for the year then ended incorporated by reference in the Form S-3
Registration Statement of Harbinger Corporation and to the reference to our
firm under the heading of "Experts" in the prospectus.


                                        /s/ Moret Ernst & Young Accountants
                                        -----------------------------------
                                        Moret Ernst & Young Accountants



The Hague
August 23, 1996

<PAGE>   1

                                                                    EXHIBIT 23.4



                         INDEPENDENT AUDITORS' CONSENT



The Board of Directors
Harbinger Corporation


We consent to the use of our report dated June 11, 1996 relating to the balance
sheet of INOVIS GmbH & Co. computergestutze Informationssysteme as of December
31, 1995 and the related statements of operations and accumulated deficit,
partners' equity, and cash flows for the year then ended incorporated by
reference in the Form S-3 Registration Statement of Harbinger Corporation and
to the reference to our firm under the heading of "Experts" in the prospectus.



                                        /s/ KPMG Deutsche Treuhand-Gesellschaft
                                        ---------------------------------------
                                        KPMG Deutsche Treuhand-Gesellschaft
                                        



Aktiengesellschaft Wirtschaftsprufungsgesellschaft
Zweigniederlassung Munchen
August 23, 1996

<PAGE>   1

                                                                    EXHIBIT 23.5



                         INDEPENDENT AUDITORS' CONSENT



The Board of Directors
Harbinger Corporation


We consent to the use of our report dated June 5, 1996 relating to the
consolidated balance sheets of Harbinger N.V. and subsidiaries as of December
31, 1995, 1994, and 1993 and the related consolidated statements of operations,
shareholders' equity, and cash flows for the two years ended December 31, 1995
and 1994 and the one month ended December 31, 1993 incorporated by reference in
the Form S-3 Registration Statement of Harbinger Corporation and to the
reference to our firm under the heading of "Experts" in the prospectus.



                                        /s/ KPMG Accountants N.V. 
                                        -------------------------
                                        KPMG Accountants N.V.
                                                                  



The Hague
August 23, 1996


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