MORGAN STANLEY DEAN WITTER EQUITY FUND
497, 2000-08-21
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<PAGE>   1

[Graphic]

                                                      PROSPECTUS - JULY 31, 2000

Morgan Stanley Dean Witter

                                                                     EQUITY FUND

                                           A MUTUAL FUND THAT SEEKS TOTAL RETURN

  The Securities and Exchange Commission has not approved or disapproved these
    securities or passed  upon the adequacy of this Prospectus. Any
      representation to the contrary is a criminal offense.
<PAGE>   2

CONTENTS


<TABLE>
<S>                             <C>                                                          <C>
The Fund                        Investment Objective........................................   1

                                Principal Investment Strategies.............................   1

                                Principal Risks.............................................   1

                                Past Performance............................................   3

                                Fees and Expenses...........................................   4

                                Additional Investment Strategy Information..................   5

                                Additional Risk Information.................................   5

                                Fund Management.............................................   6

Shareholder Information         Pricing Fund Shares.........................................   7

                                How to Buy Shares...........................................   7

                                How to Exchange Shares......................................   8

                                How to Sell Shares..........................................  11

                                Distributions...............................................  12

                                Tax Consequences............................................  13

                                Share Class Arrangements....................................  13

Financial Highlights            ............................................................  20

Our Family of Funds             ...............................................Inside Back Cover
</TABLE>

                This Prospectus contains important information about the Fund.
                Please read it carefully and keep it for future reference.
<PAGE>   3




THE FUND

TOTAL RETURN

An investment objective having the goal of selecting securities with the
potential to rise in price and pay out income.



[TARGET ICON]                   INVESTMENT OBJECTIVE

Morgan Stanley Dean Witter Equity Fund seeks total return.

[CHESS ICON]            PRINCIPAL INVESTMENT STRATEGIES

The Fund will normally invest at least 65% of its total assets in common stock
and other equity securities, including depository receipts. The Fund's
"Sub-Advisor," Miller Anderson & Sherrerd, LLP, invests the Fund's assets by
pursuing an investing strategy that combines both value and growth styles. The
Fund has two teams of portfolio managers: a value team and a growth team. Each
manager works independently within the style of his or her specific team. Each
team has a team leader who participates in administering the value/growth
style-tilt of the portfolio and monitors certain other oversight functions.

The Sub-Advisor's investment process is designed to identify growing companies
whose stock in the Sub-Advisor's opinion is attractively valued and has low but
rising expectations, and to diversify holdings across market sectors. Individual
securities are selected based on, among other things, quantitative screens and
fundamental research by in-house industry analysts.

In addition, the Fund may invest up to 25% of its total assets in foreign
securities. This percentage limitation, however, does not apply to securities of
foreign companies that are listed in the U.S. on a national securities exchange.
Common stock is a share ownership or equity interest in a corporation. It may or
may not pay dividends, as some companies reinvest all of their profits back into
their businesses, while others pay out some of their profits to shareholders as
dividends. A depository receipt is generally issued by a bank or financial
institution and represents an ownership interest in the common stock or other
equity securities of a foreign company.

The Fund also may invest in convertible and fixed-income securities.

In pursuing the Fund's investment objective, the Sub-Advisor has considerable
leeway in deciding which investments it buys, holds or sells on a day-to-day
basis -- and which trading strategies it uses. For example, the Sub-Advisor in
its discretion may determine to use some permitted trading strategies while not
using others.

[SCALE ICON]                     PRINCIPAL RISKS

There is no assurance that the Fund will achieve its investment objective. The
Fund's share price will fluctuate with changes in the market value of the Fund's
portfolio securities. When you sell Fund shares, they may be worth less than
what you paid for them and, accordingly, you can lose money investing in this
Fund.

COMMON STOCKS. A principal risk of investing in the Fund is associated with its
common stock investments. In general, stock values fluctuate in response to
activities specific to the company as well as general market, economic and
political conditions. Stock prices can fluctuate widely in response to these
factors.

FOREIGN SECURITIES. The Fund's investments in foreign securities may involve
risks in addition to the risks associated with domestic securities. One
additional risk is currency risk. While the price of Fund shares is quoted in
U.S. dollars, the Fund generally converts U.S. dollars to a foreign market's
local currency to purchase a security in that market. If the value of that local
currency falls relative to the U.S.



                                                                               1

<PAGE>   4



dollar, the U.S. dollar value of the foreign security will decrease. This is
true even if the foreign security's local price remains unchanged.

Foreign securities (including depository receipts) also have risks related to
economic and political developments abroad, including expropriations,
confiscatory taxation, exchange control regulation, limitations on the use or
transfer of Fund assets and any effects of foreign social, economic or political
instability. Foreign companies, in general, are not subject to the regulatory
requirements of U.S. companies and, as such, there may be less publicly
available information about these companies. Moreover, foreign accounting,
auditing and financial reporting standards generally are different from those
applicable to U.S. companies. Finally, in the event of a default of any foreign
debt obligations, it may be more difficult for the Fund to obtain or enforce a
judgment against the issuers of the securities.

Securities of foreign issuers may be less liquid than comparable securities of
U.S. issuers and, as such, their price changes may be more volatile.
Furthermore, foreign exchanges and broker-dealers are generally subject to less
government and exchange scrutiny and regulation than their U.S. counterparts. In
addition, differences in clearance and settlement procedures in foreign markets
may occasion delays in settlements of the Fund's trades effected in those
markets.

OTHER RISKS. The performance of the Fund also will depend on whether the Sub-
Advisor is successful in pursuing the Fund's investment strategy. The Fund is
subject to other risks from its permissible investments including the risks
associated with convertible and fixed-income securities. For more information
about these risks, see the "Additional Risk Information" section.

Shares of the Fund are not bank deposits and are not guaranteed or insured by
the FDIC or any other government agency.



2
<PAGE>   5

                                                                               3

ANNUAL TOTAL RETURN

This chart shows the performance of the Fund's Class B shares in the past
calendar year.

AVERAGE ANNUAL TOTAL RETURNS

This table compares the Fund's average annual total returns with those of a
broad measure of market performance over time. The Fund's returns include the
maximum applicable sales charge for each Class and assume you sold your shares
at the end of each period.



[CALENDAR ICON]                 PAST PERFORMANCE

The bar chart and table below provide some indication of the risks of investing
in the Fund. The Fund's past performance does not indicate how the Fund will
perform in the future.

ANNUAL TOTAL RETURNS -- CALENDAR YEAR
[graph]

<TABLE>
<CAPTION>
YEAR                    TOTAL RETURN
----                    ------------
<S>                     <C>
1999                        26.78
</TABLE>

The bar chart reflects the performance of Class B shares; the performance of the
other Classes will differ because the Classes have different ongoing fees. The
 performance information in the bar chart does not reflect the deduction of
 sales charges; if these amounts were reflected, returns would be less than
 shown. Year-to-date total return as of June 30, 2000 was 0%.

During the period shown in the bar chart, the highest return for a calendar
quarter was 19.40% (quarter ended December 31, 1999), and the lowest return for
a calendar quarter was -9.55% (quarter ended September 30, 1999).

<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS (AS OF DECEMBER 31, 1999)
---------------------------------------------------------------------------------------
                                                                     LIFE OF FUND
                                                      PAST 1 YEAR   (SINCE 7/29/98)
---------------------------------------------------------------------------------------
<S>                                                   <C>           <C>             <C>
 Class A                                               20.94%         17.40%
---------------------------------------------------------------------------------------
 Class B                                               21.78%         18.42%
---------------------------------------------------------------------------------------
 Class C                                               26.17%         21.29%
---------------------------------------------------------------------------------------
 Class D                                               28.00%         22.25%
---------------------------------------------------------------------------------------
 S&P 500 Index(1)                                      21.04%         22.33%
---------------------------------------------------------------------------------------
</TABLE>

 1 The Standard & Poor's(R) 500 Stock Index (S&P 500) is a broad-based index,
   the performance of which is based on the performance of 500 widely held
   common stocks chosen for market size, liquidity, and industry group
   representation. The performance of the Index does not include any expenses,
   fees or charges. The Index is unmanaged and should not be considered an
   investment.
<PAGE>   6




SHAREHOLDER FEES

These fees are paid directly from your investment.

ANNUAL FUND
OPERATING EXPENSES

These expenses are deducted from the Fund's assets and are based on expenses
paid for the fiscal year ended May 31, 2000.



[CASH ICON]              FEES AND EXPENSES

The table below briefly describes the fees and expenses that you may pay if you
buy and hold shares of the Fund. The Fund offers four Classes of shares: Classes
A, B, C and D. Each Class has a different combination of fees, expenses and
other features. The Fund does not charge account or exchange fees. See the
"Share Class Arrangements" section for further fee and expense information.

<TABLE>
<CAPTION>
                                            CLASS A   CLASS B   CLASS C   CLASS D
-------------------------------------------------------------------------------------
<S>                                         <C>       <C>       <C>       <C>
 SHAREHOLDER FEES
-------------------------------------------------------------------------------------
 Maximum sales charge (load) imposed on
 purchases (as a percentage of offering
 price)                                      5.25%(1)   None      None      None
-------------------------------------------------------------------------------------
 Maximum deferred sales charge (load) (as
 a percentage based on the lesser of the
 offering price or net asset value at
 redemption)                                  None(2) 5.00%(3)  1.00%(4)    None
-------------------------------------------------------------------------------------
 ANNUAL FUND OPERATING EXPENSES
-------------------------------------------------------------------------------------
 Management fee                              0.85%     0.85%     0.85%     0.85%
-------------------------------------------------------------------------------------
 Distribution and service (12b-1) fees       0.25%     1.00%     1.00%      None
-------------------------------------------------------------------------------------
 Other expenses                              0.19%     0.19%     0.19%     0.19%
-------------------------------------------------------------------------------------
 Total annual Fund operating expenses        1.29%     2.04%     2.04%     1.04%
-------------------------------------------------------------------------------------
</TABLE>

 1 Reduced for purchases of $25,000 and over.

 2 Investments that are not subject to any sales charge at the time of purchase
   are subject to a contingent deferred sales charge ("CDSC") of 1.00% that will
   be imposed if you sell your shares within one year after purchase, except for
   certain specific circumstances.

 3 The CDSC is scaled down to 1.00% during the sixth year, reaching zero
   thereafter. See "Share Class Arrangements" for a complete discussion of the
   CDSC.

 4 Only applicable if you sell your shares within one year after purchase.

EXAMPLE

This example is intended to help you compare the cost of investing in the Fund
with the cost of investing in other mutual funds.

The example assumes that you invest $10,000 in the Fund, your investment has a
5% return each year, and the Fund's operating expenses remain the same. Although
your actual costs may be higher or lower, the tables below show your costs at
the end of each period based on these assumptions depending upon whether or not
you sell your shares at the end of each period.

<TABLE>
<CAPTION>
                      IF YOU SOLD YOUR SHARES:                    IF YOU HELD YOUR SHARES:
                      --------------------------------------------------------------------------------------
                      1 YEAR    3 YEARS   5 YEARS   10 YEARS      1 YEAR    3 YEARS   5 YEARS   10 YEARS
------------------------------------------------------------------------------------------------------------
<S>                   <C>       <C>       <C>       <C>           <C>       <C>       <C>       <C>
 CLASS A               $649      $913     $1,195     $2,000        $649      $913     $1,195     $2,000

----------------------------------------------------------------------------------------------------------
 CLASS B               $707      $940     $1,298     $2,369        $207      $640     $1,098     $2,369

----------------------------------------------------------------------------------------------------------
 CLASS C               $307      $640     $1,098     $2,369        $207      $640     $1,098     $2,369

----------------------------------------------------------------------------------------------------------
 CLASS D               $106      $331     $  574     $1,271        $106      $331     $  574     $1,271

----------------------------------------------------------------------------------------------------------
</TABLE>

Long-term shareholders of Class B and Class C may pay more in sales charges,
including distribution fees, than the economic equivalent of the maximum
front-end sales charges permitted by the NASD.





4
<PAGE>   7



[CHESS ICON]            ADDITIONAL INVESTMENT STRATEGY INFORMATION

This section provides additional information relating to the Fund's principal
investment strategies.

CONVERTIBLE AND FIXED-INCOME SECURITIES. The Fund may invest up to 35% of its
total assets in (i) convertible securities (which may be rated below investment
grade commonly known as "junk bonds"), (ii) investment grade fixed-income
securities of domestic and foreign companies and governments and international
organizations, and (iii) U.S. government securities.

DEFENSIVE INVESTING. The Fund may take temporary "defensive" positions in
attempting to respond to adverse market conditions. The Fund may invest any
amount of its total assets in cash or money market instruments in a defensive
posture when the Investment Manager or Sub-Advisor believes it is advisable to
do so. Although taking a defensive posture is designed to protect the Fund from
an anticipated market downturn, it could have the effect of reducing the benefit
from any upswing in the market. When the Fund takes a defensive position, it may
not achieve its investment objective.

PORTFOLIO TURNOVER. The Fund may engage in active and frequent trading of its
portfolio securities. The Financial Highlights Table at the end of this
Prospectus shows the Fund's portfolio turnover rates during the fiscal year
ended May 31, 2000 and for the period July 29, 1998 (commencement of operations)
through May 31, 1999. A portfolio turnover rate of 200%, for example, is
equivalent to the Fund buying and selling all of its securities two times during
the course of the year. A high portfolio turnover rate (over 100%) could result
in high brokerage costs and an increase in taxable capital gains distributions
to the Fund's shareholders. See the sections on "Distributions" and "Tax
Consequences."

The percentage limitations relating to the composition of the Fund's portfolio
apply at the time the Fund acquires an investment and refer to the Fund's net
assets unless otherwise noted. Subsequent percentage changes that result from
market fluctuations will not require the Fund to sell any portfolio security.
The Fund may change its principal investment strategies without shareholder
approval; however, you would be notified of any changes.

[SCALE ICON]                     ADDITIONAL RISK INFORMATION

This section provides additional information relating to the principal risks of
investing in the Fund.

CONVERTIBLE SECURITIES. Investments in convertible securities subject the Fund
to the risks associated with both fixed-income securities and common stocks. To
the extent that a convertible security's investment value is greater than its
conversion value, its price will likely increase when interest rates fall and
decrease when interest rates rise, as with a fixed-income security. If the
conversion value exceeds the investment value, the price of the convertible
security will tend to fluctuate directly with the price of the underlying equity
security. The convertible securities in which the Fund may invest may be below
investment grade. Securities below investment grade are commonly known as "junk
bonds" and have speculative characteristics.

FIXED-INCOME SECURITIES. All fixed-income securities are subject to two types of
risk: credit risk and interest rate risk. Credit risk refers to the possibility
that the issuer of a security will be unable to make interest payments and/or
repay the principal on its debt. Certain investment grade fixed-income
securities have speculative characteristics.





                                                                              5
<PAGE>   8


MORGAN STANLEY DEAN
WITTER ADVISORS INC.

The Investment Manager is widely recognized as a leader in the mutual fund
industry and together with Morgan Stanley Dean Witter Services Company Inc., its
wholly- owned subsidiary, had approximately $150 billion in assets under
management as of June 30, 2000.

Interest rate risk refers to fluctuations in the value of a fixed-income
security resulting from changes in the general level of interest rates. When the
general level of interest rate goes up, the prices of most fixed-income
securities goes down. When the general level of interest rates goes down, the
prices of most fixed-income securities goes up. Accordingly, a rise in the
general level of interest rates may cause the price of the Fund's fixed-income
securities to fall substantially.



[PEOPLE ICON]                     FUND MANAGEMENT

The Fund has retained the Investment Manager -- Morgan Stanley Dean Witter
Advisors Inc. -- to provide administrative services and manage its business
affairs. The Investment Manager has, in turn, contracted with the
Sub-Advisor -- Miller Anderson & Sherrerd, LLP -- to invest the Fund's assets,
including the placing of orders for the purchase and sale of portfolio
securities. The Investment Manager is a wholly-owned subsidiary of Morgan
Stanley Dean Witter & Co., a preeminent global financial services firm that
maintains leading market positions in each of its three primary businesses:
securities, asset management and credit services. Its main business office is
located at Two World Trade Center, New York, New York 10048.

The Sub-Advisor manages assets of approximately $78 billion as of June 30, 2000
for investment companies, employee benefit plans, endowments, foundation and
other institutional investors. The Sub-Advisor is an indirect subsidiary of
Morgan Stanley Dean Witter & Co. The Sub-Advisor's address is One Tower Bridge,
West Conshohocken, Pennsylvania.

The Fund's assets are managed by a team of four portfolio managers who may
concentrate on either "growth" or "value" sectors in selecting investments for
the Fund's portfolio. Steven Epstein, Brian Kramp, Christopher Leavy and Eric
Scharpf are currently the primary portfolio managers of the Fund (Messrs.
Epstein, Leavy and Scharpf since December, 1999; Mr. Kramp since the Fund's
inception). Mr. Epstein is a Vice President of the Sub-Advisor and has been a
Financial Analyst with the Sub-Advisor since 1996; prior thereto he attended the
Wharton School of the University of Pennsylvania (1994-1996), receiving an MBA.
Mr. Kramp is a Principal of the Sub-Advisor and has been affiliated with the
Sub-Advisor since 1997; prior to that he was an analyst/portfolio manager with
Meridian Investment Company (1984-1997). Mr. Leavy is a Vice President of the
Sub-Advisor and has been affiliated with the Sub-Advisor since 1997; prior
thereto he served as a portfolio manager for Crestar Asset Management
(1995-1997). Mr. Scharpf is a Vice President of the Sub-Advisor and has been a
Financial Analyst with the Sub-Advisor since 1997; prior thereto he attended the
Wharton School of the University of Pennsylvania (1995-1997), receiving an MBA.
In addition, a group of four individuals, Arden Armstrong, James Jolinger,
Robert Marcin and Gary Schlarbaum, render assistance to the primary portfolio
managers by providing financial and market analysis and idea generation with
respect to securities. Ms. Armstrong, Mr. Marcin and Mr. Schlarbaum are Managing
Directors of the Sub-Advisor and have been managing portfolios for the
Sub-Advisor for over five years. Mr. Jolinger is a Principal of the Sub-Advisor
and the Director of Research; he has been associated with the Sub-Advisor for
over five years.

The Fund pays the Investment Manager a monthly management fee as full
compensation for the services and facilities furnished to the Fund, and for Fund
expenses assumed by the Investment Manager. The fee is based on the Fund's
average daily net assets. For the fiscal year ended May 31, 2000, the Fund
accrued total compensation to the Investment Manager amounting to 0.85% of the
Fund's average daily net assets. The Investment Manager pays the Sub-Advisor
compensation equal to 40% of its compensation for services and facilities
furnished to the Fund.



6
<PAGE>   9





SHAREHOLDER INFORMATION
CONTACTING A
FINANCIAL ADVISOR

If you are new to the Morgan Stanley Dean Witter Family of Funds and would like
to contact a Financial Advisor, call (877) 937-MSDW (toll-free) for the
telephone number of the Morgan Stanley Dean Witter office nearest you. You may
also access our office locator on our Internet site at:
www.msdw.com/individual/funds



[DOLLAR ICON]                   PRICING FUND SHARES

The price of Fund shares (excluding sales charges), called "net asset value," is
based on the value of the Fund's portfolio securities. While the assets of each
Class are invested in a single portfolio of securities, the net asset value of
each Class will differ because the Classes have different ongoing distribution
fees.

The net asset value per share of the Fund is determined once daily at 4:00 p.m.
Eastern time on each day that the New York Stock Exchange is open (or, on days
when the New York Stock Exchange closes prior to 4:00 p.m., at such earlier
time). Shares will not be priced on days that the New York Stock Exchange is
closed.

The value of the Fund's portfolio securities is based on the securities' market
price when available. When a market price is not readily available, including
circumstances under which the Investment Manager and/or Sub-Advisor determine
that a security's market price is not accurate, a portfolio security is valued
at its fair value, as determined under procedures established by the Fund's
Board of Trustees. In these cases, the Fund's net asset value will reflect
certain portfolio securities' fair value rather than their market price. With
respect to securities that are primarily listed on foreign exchanges, the value
of the Fund's portfolio securities may change on days when you will not be able
to purchase or sell your shares.

An exception to the Fund's general policy of using market prices concerns its
short-term debt portfolio securities. Debt securities with remaining maturities
of sixty days or less at the time of purchase are valued at amortized cost.
However, if the cost does not reflect the securities' market value, these
securities will be valued at their fair value.

[HANDS ICON]                       HOW TO BUY SHARES

You may open a new account to buy Fund shares or buy additional Fund shares for
an existing account by contacting your Morgan Stanley Dean Witter Financial
Advisor or other authorized financial representative. Your Financial Advisor
will assist you, step-by-step, with the procedures to invest in the Fund. You
may also purchase shares directly by calling the Fund's transfer agent and
requesting an application.

Because every investor has different immediate financial needs and long-term
investment goals, the Fund offers investors four Classes of shares: Classes A,
B, C and D. Class D shares are only offered to a limited group of investors.
Each Class of shares offers a distinct structure of sales charges, distribution
and service fees, and other features that are designed to address a variety of
needs. Your Financial Advisor or other authorized financial representative can
help you decide which Class may be most appropriate for you. When purchasing
Fund shares, you must specify which Class of shares you wish to purchase.

When you buy Fund shares, the shares are purchased at the next share price
calculated (less any applicable front-end sales charge for Class A shares) after
we receive your purchase order. Your payment is due on the third business day
after you place your purchase order. We reserve the right to reject any order
for the purchase of Fund shares.





                                                                              7
<PAGE>   10




EASYINVEST(SM)

A purchase plan that allows you to transfer money automatically from your
checking or savings account or from a Money Market Fund on a semi-monthly,
monthly or quarterly basis. Contact your Morgan Stanley Dean Witter Financial
Advisor for further information about this service.



<TABLE>
<CAPTION>
MINIMUM INVESTMENT AMOUNTS
---------------------------------------------------------------------------------------------
                                                                    MINIMUM INVESTMENT
                                                              -------------------------------
INVESTMENT OPTIONS                                                INITIAL      ADDITIONAL
---------------------------------------------------------------------------------------------
<S>                            <C>                               <C>          <C>
 Regular Accounts                                                 $1,000          $100
---------------------------------------------------------------------------------------------
 Individual Retirement
 Accounts:                     Regular IRAs                       $1,000          $100
                               Education IRAs                      $500           $100
---------------------------------------------------------------------------------------------
 EasyInvest(SM)                (Automatically from your
                               checking or savings account or
                               Money Market Fund)                  $100*          $100*
---------------------------------------------------------------------------------------------
</TABLE>

* Provided your schedule of investments totals $1,000 in twelve months.

There is no minimum investment amount if you purchase Fund shares through: (1)
the Investment Manager's mutual fund asset allocation plan, (2) a program,
approved by the Fund's distributor, in which you pay an asset-based fee for
advisory, administrative and/or brokerage services, or (3) employer-sponsored
employee benefit plan accounts.

INVESTMENT OPTIONS FOR CERTAIN INSTITUTIONAL AND OTHER INVESTORS/CLASS D
SHARES. To be eligible to purchase Class D shares, you must qualify under one of
the investor categories specified in the "Share Class Arrangements" section of
this Prospectus.

SUBSEQUENT INVESTMENTS SENT DIRECTLY TO THE FUND. In addition to buying
additional Fund shares for an existing account by contacting your Morgan Stanley
Dean Witter Financial Advisor, you may send a check directly to the Fund. To buy
additional shares in this manner:

- Write a "letter of instruction" to the Fund specifying the name(s) on the
  account, the account number, the social security or tax identification number,
  the Class of shares you wish to purchase, and the investment amount (which
  would include any applicable front-end sales charge). The letter must be
  signed by the account owner(s).

- Make out a check for the total amount payable to: Morgan Stanley Dean Witter
  Equity Fund.

- Mail the letter and check to Morgan Stanley Dean Witter Trust FSB at P.O. Box
  1040, Jersey City, NJ 07303.

[ARROWS ICON]                     HOW TO EXCHANGE SHARES

PERMISSIBLE FUND EXCHANGES. You may exchange shares of any Class of the Fund for
the same Class of any other continuously offered Multi-Class Fund, or for shares
of a No-Load Fund, a Money Market Fund, North American Government Income Trust
or Short-Term U.S. Treasury Trust, without the imposition of an exchange fee. In
addition, Class A shares of the Fund may be exchanged for shares of an FSC Fund
(funds subject to a front-end sales charge). See the inside back cover of this
Prospectus for each Morgan Stanley Dean Witter Fund's designation as a
Multi-Class Fund, No-Load Fund, Money Market Fund or FSC Fund. If a Morgan
Stanley Dean Witter Fund is not listed, consult the inside back cover of that
Fund's prospectus for its designation.

Exchanges may be made after shares of the Fund acquired by purchase have been
held for thirty days. There is no waiting period for exchanges of shares
acquired by exchange or dividend reinvestment. The current prospectus for each
fund describes




8
<PAGE>   11


its investment objective(s), policies and investment minimum, and should be read
before investment. Since exchanges are available only into continuously offered
Morgan Stanley Dean Witter Funds, exchanges are not available into any new
Morgan Stanley Dean Witter Fund during its initial offering period, or when
shares of a particular Morgan Stanley Dean Witter Fund are not being offered for
purchase.

EXCHANGE PROCEDURES. You can process an exchange by contacting your Morgan
Stanley Dean Witter Financial Advisor or other authorized financial
representative. Otherwise, you must forward an exchange privilege authorization
form to the Fund's transfer agent -- Morgan Stanley Dean Witter Trust FSB -- and
then write the transfer agent or call (800) 869-NEWS to place an exchange order.
You can obtain an exchange privilege authorization form by contacting your
Financial Advisor or other authorized financial representative or by calling
(800) 869-NEWS. If you hold share certificates, no exchanges may be processed
until we have received all applicable share certificates.

An exchange to any Morgan Stanley Dean Witter Fund (except a Money Market Fund)
is made on the basis of the next calculated net asset values of the funds
involved after the exchange instructions are accepted. When exchanging into a
Money Market Fund, the Fund's shares are sold at their next calculated net asset
value and the Money Market Fund's shares are purchased at their net asset value
on the following business day.

The Fund may terminate or revise the exchange privilege upon required notice.
The check writing privilege is not available for Money Market Fund shares you
acquire in an exchange.

TELEPHONE EXCHANGES. For your protection when calling Morgan Stanley Dean Witter
Trust FSB, we will employ reasonable procedures to confirm that exchange
instructions communicated over the telephone are genuine. These procedures may
include requiring various forms of personal identification such as name, mailing
address, social security or other tax identification number. Telephone
instructions also may be recorded.

Telephone instructions will be accepted if received by the Fund's transfer agent
between 9:00 a.m. and 4:00 p.m. Eastern time on any day the New York Stock
Exchange is open for business. During periods of drastic economic or market
changes, it is possible that the telephone exchange procedures may be difficult
to implement, although this has not been the case with the Fund in the past.

MARGIN ACCOUNTS. If you have pledged your Fund shares in a margin account,
contact your Morgan Stanley Dean Witter Financial Advisor or other authorized
financial representative regarding restrictions on the exchange of such shares.

TAX CONSIDERATIONS OF EXCHANGES. If you exchange shares of the Fund for shares
of another Morgan Stanley Dean Witter Fund there are important tax
considerations. For tax purposes, the exchange out of the Fund is considered a
sale of the Fund's shares -- and the exchange into the other fund is considered
a purchase. As a result, you may realize a capital gain or loss.

You should review the "Tax Consequences" section and consult your own tax
professional about the tax consequences of an exchange.

LIMITATIONS ON EXCHANGES. Certain patterns of past exchanges and/or purchase or
sale transactions involving the Fund or other Morgan Stanley Dean Witter Funds
may result in the Fund limiting or prohibiting, at its discretion, additional
purchases and/or exchanges. Determinations in this regard may be made based on
the




                                                                              9
<PAGE>   12



frequency or dollar amount of the previous exchanges or purchase or sale
transactions. You will be notified in advance of limitations on your exchange
privileges.

CDSC CALCULATIONS ON EXCHANGES. See the "Share Class Arrangements" section of
this Prospectus for a discussion of how applicable contingent deferred sales
charges (CDSCs) are calculated for shares of one Morgan Stanley Dean Witter Fund
that are exchanged for shares of another.

For further information regarding exchange privileges, you should contact your
Morgan Stanley Dean Witter Financial Advisor or call (800) 869-NEWS.




10
<PAGE>   13




[HANDS ICON]                    HOW TO SELL SHARES

You can sell some or all of your Fund shares at any time. If you sell Class A,
Class B or Class C shares, your net sale proceeds are reduced by the amount of
any applicable CDSC. Your shares will be sold at the next price calculated after
we receive your order to sell as described below.

<TABLE>
<CAPTION>
OPTIONS              PROCEDURES
<S>                  <C>
---------------------------------------------------------------------------------
 Contact Your        To sell your shares, simply call your Morgan Stanley Dean
 Financial Advisor   Witter Financial Advisor or other authorized financial
 [PHONE ICON]        representative.
                     ------------------------------------------------------------
                     Payment will be sent to the address to which the account is
                     registered or deposited in your brokerage account.
---------------------------------------------------------------------------------
 By Letter           You can also sell your shares by writing a "letter of
 [LETTER ICON]       instruction" that includes:
                     - your account number;
                     - the dollar amount or the number of shares you wish to
                     sell;
                     - the Class of shares you wish to sell; and
                     - the signature of each owner as it appears on the account.
                     ------------------------------------------------------------
                     If you are requesting payment to anyone other than the
                     registered owner(s) or that payment be sent to any address
                     other than the address of the registered owner(s) or
                     pre-designated bank account, you will need a signature
                     guarantee. You can obtain a signature guarantee from an
                     eligible guarantor acceptable to Morgan Stanley Dean Witter
                     Trust FSB. (You should contact Morgan Stanley Dean Witter
                     Trust FSB at (800) 869-NEWS for a determination as to
                     whether a particular institution is an eligible guarantor.)
                     A notary public cannot provide a signature guarantee.
                     Additional documentation may be required for shares held by
                     a corporation, partnership, trustee or executor.
                     ------------------------------------------------------------
                     Mail the letter to Morgan Stanley Dean Witter Trust FSB at
                     P.O. Box 983, Jersey City, NJ 07303. If you hold share
                     certificates, you must return the certificates, along with
                     the letter and any required additional documentation.
                     ------------------------------------------------------------
                     A check will be mailed to the name(s) and address in which
                     the account is registered, or otherwise according to your
                     instructions.
---------------------------------------------------------------------------------
 Systematic          If your investment in all of the Morgan Stanley Dean Witter
 Withdrawal Plan     Family of Funds has a total market value of at least
 [ARROWS ICON]       $10,000, you may elect to withdraw amounts of $25 or more,
                     or in any whole percentage of a fund's balance (provided the
                     amount is at least $25), on a monthly, quarterly,
                     semi-annual or annual basis, from any fund with a balance of
                     at least $1,000. Each time you add a fund to the plan, you
                     must meet the plan requirements.
                     ------------------------------------------------------------
                     Amounts withdrawn are subject to any applicable CDSC. A CDSC
                     may be waived under certain circumstances. See the Class B
                     waiver categories listed in the "Share Class Arrangements"
                     section of this Prospectus.
                     ------------------------------------------------------------
                     To sign up for the systematic withdrawal plan, contact your
                     Morgan Stanley Dean Witter Financial Advisor or call (800)
                     869-NEWS. You may terminate or suspend your plan at any
                     time. Please remember that withdrawals from the plan are
                     sales of shares, not Fund "distributions," and ultimately
                     may exhaust your account balance. The Fund may terminate or
                     revise the plan at any time.
---------------------------------------------------------------------------------
</TABLE>

PAYMENT FOR SOLD SHARES. After we receive your complete instructions to sell as
described above, a check will be mailed to you within seven days, although we
will attempt to make payment within one business day. Payment may also be sent
to your brokerage account.

Payment may be postponed or the right to sell your shares suspended under
unusual circumstances. If you request to sell shares that were recently
purchased by check, your sale will not be effected until it has been verified
that the check has been honored.





                                                                              11
<PAGE>   14



TARGETED DIVIDENDS(SM)

You may select to have your Fund distributions automatically invested in other
Classes of Fund shares or Classes of another Morgan Stanley Dean Witter Fund
that you own. Contact your Morgan Stanley Dean Witter Financial Advisor for
further information about this service.

TAX CONSIDERATIONS. Normally, your sale of Fund shares is subject to federal and
state income tax. You should review the "Tax Consequences" section of this
Prospectus and consult your own tax professional about the tax consequences of a
sale.

REINSTATEMENT PRIVILEGE. If you sell Fund shares and have not previously
exercised the reinstatement privilege, you may, within 35 days after the date of
sale, invest any portion of the proceeds in the same Class of Fund shares at
their net asset value and receive a pro rata credit for any CDSC paid in
connection with the sale.

INVOLUNTARY SALES. The Fund reserves the right, on sixty days' notice, to sell
the shares of any shareholder (other than shares held in an IRA or 403(b)
Custodial Account) whose shares, due to sales by the shareholder, have a value
below $100, or in the case of an account opened through EasyInvest(SM), if after
12 months the shareholder has invested less than $1,000 in the account.

However, before the Fund sells your shares in this manner, we will notify you
and allow you sixty days to make an additional investment in an amount that will
increase the value of your account to at least the required amount before the
sale is processed. No CDSC will be imposed on any involuntary sale.

MARGIN ACCOUNTS. If you have pledged your Fund shares in a margin account,
contact your Morgan Stanley Dean Witter Financial Advisor or other authorized
financial representative regarding restrictions on the sale of such shares.



[CHECK BOX ICON]                DISTRIBUTIONS

The Fund passes substantially all of its earnings from income and capital gains
along to its investors as "distributions." The Fund earns income from stocks and
interest from fixed-income investments. These amounts are passed along to Fund
shareholders as "income dividend distributions." The Fund realizes capital gains
whenever it sells securities for a higher price than it paid for them. These
amounts may be passed along as "capital gain distributions."

The Fund declares income dividends separately for each Class. Distributions paid
on Class A and Class D shares will be higher than for Class B and Class C
because distribution fees that Class B and Class C pay are higher. Normally,
income dividends are distributed to shareholders annually. Capital gains, if
any, are usually distributed in December.

The Fund, however, may retain and reinvest any long-term capital gains. The Fund
may at times make payments from sources other than income or capital gains that
represent a return of a portion of your investment.

Distributions are reinvested automatically in additional shares of the same
Class and automatically credited to your account, unless you request in writing
that all distributions be paid in cash. If you elect the cash option, the Fund
will mail a check to you no later than seven business days after the
distribution is declared. However, if you purchase Fund shares prior to the
record date for the distribution, and payment for such shares is received after
the record date, the distribution will automatically be paid to you in cash,
even if you did not request to receive all distributions in cash. No interest
will accrue on uncashed checks. If you wish to change how your distributions are
paid, your request should be received by the Fund's transfer agent, Morgan
Stanley Dean Witter Trust FSB, at least five business days prior to the record
date of the distributions.




12
<PAGE>   15




[1040 ICON]                     TAX CONSEQUENCES

As with any investment, you should consider how your Fund investment will be
taxed. The tax information in this Prospectus is provided as general
information. You should consult your own tax professional about the tax
consequences of an investment in the Fund.

Unless your investment in the Fund is through a tax-deferred retirement account,
such as a 401(k) plan or IRA, you need to be aware of the possible tax
consequences when:

- The Fund makes distributions; and

- You sell Fund shares, including an exchange to another Morgan Stanley Dean
  Witter Fund.

TAXES ON DISTRIBUTIONS. Your distributions are normally subject to federal and
state income tax when they are paid, whether you take them in cash or reinvest
them in Fund shares. A distribution also may be subject to local income tax. Any
income dividend distributions and any short-term capital gain distributions are
taxable to you as ordinary income. Any long-term capital gain distributions are
taxable as long-term capital gains, no matter how long you have owned shares in
the Fund.

Every January, you will be sent a statement (IRS Form 1099-DIV) showing the
taxable distributions paid to you in the previous year. The statement provides
information on your dividends and capital gains for tax purposes.

TAXES ON SALES. Your sale of Fund shares normally is subject to federal and
state income tax and may result in a taxable gain or loss to you. A sale also
may be subject to local income tax. Your exchange of Fund shares for shares of
another Morgan Stanley Dean Witter Fund is treated for tax purposes like a sale
of your original shares and a purchase of your new shares. Thus, the exchange
may, like a sale, result in a taxable gain or loss to you and will give you a
new tax basis for your new shares.

When you open your Fund account, you should provide your Social Security or tax
identification number on your investment application. By providing this
information, you will avoid being subject to a federal backup withholding tax of
31% on taxable distributions and redemption proceeds. Any withheld amount would
be sent to the IRS as an advance tax payment.

[ABCD ICON]                       SHARE CLASS ARRANGEMENTS

The Fund offers several Classes of shares having different distribution
arrangements designed to provide you with different purchase options according
to your investment needs. Your Morgan Stanley Dean Witter Financial Advisor or
other authorized financial representative can help you decide which Class may be
appropriate for you.

The general public is offered three Classes: Class A shares, Class B shares and
Class C shares, which differ principally in terms of sales charges and ongoing
expenses. A fourth Class, Class D shares, is offered only to a limited category
of investors. Shares that you acquire through reinvested distributions will not
be subject to any front-end sales charge or CDSC -- contingent deferred sales
charge. Sales personnel may receive different compensation for selling each
Class of shares. The sales charges applicable to each Class provide for the
distribution financing of shares of that Class.





                                                                             13

<PAGE>   16



FRONT-END SALES CHARGE OR FSC

An initial sales charge you pay when purchasing Class A shares that is based on
a percentage of the offering price. The percentage declines based upon the
dollar value of Class A shares you purchase. We offer three ways to reduce your
Class A sales charges -- the Combined Purchase Privilege, Right of Accumulation
and Letter of Intent.



The chart below compares the sales charge and annual 12b-1 fee applicable to
each Class:

<TABLE>
<CAPTION>
                                                                       MAXIMUM
CLASS      SALES CHARGE                                            ANNUAL 12b-1 FEE
<S>        <C>                                                     <C>
---------------------------------------------------------------------------------------
 A         Maximum 5.25% initial sales charge reduced for
           purchase of $25,000 or more; shares sold
           without an initial sales charge are generally
           subject to a 1.0% CDSC during the first year.             0.25%
---------------------------------------------------------------------------------------
 B         Maximum 5.0% CDSC during the first year
           decreasing to 0% after six years.                          1.0%
---------------------------------------------------------------------------------------
 C         1.0% CDSC during first year                                1.0%
---------------------------------------------------------------------------------------
 D         None                                                       None
---------------------------------------------------------------------------------------
</TABLE>

 CLASS A SHARES  Class A shares are sold at net asset value plus an initial
sales charge of up to 5.25%. The initial sales charge is reduced for purchases
of $25,000 or more according to the schedule below. Investments of $1 million or
more are not subject to an initial sales charge, but are generally subject to a
contingent deferred sales charge, or CDSC, of 1.0% on sales made within one year
after the last day of the month of purchase. The CDSC will be assessed in the
same manner and with the same CDSC waivers as with Class B shares. Class A
shares are also subject to a distribution (12b-1) fee of up to 0.25% of the
average daily net assets of the Class.

The offering price of Class A shares includes a sales charge (expressed as a
percentage of the offering price) on a single transaction as shown in the
following table:

<TABLE>
<CAPTION>
                                                  FRONT-END SALES CHARGE
                                    --------------------------------------------------
                                        PERCENTAGE OF       APPROXIMATE PERCENTAGE
AMOUNT OF SINGLE TRANSACTION        PUBLIC OFFERING PRICE   OF NET AMOUNT INVESTED
--------------------------------------------------------------------------------------
<S>                                 <C>                     <C>
 Less than $25,000                      5.25%                   5.54%
--------------------------------------------------------------------------------------
 $25,000 but less than $50,000          4.75%                   4.99%
--------------------------------------------------------------------------------------
 $50,000 but less than $100,000         4.00%                   4.17%
--------------------------------------------------------------------------------------
 $100,000 but less than $250,000        3.00%                   3.09%
--------------------------------------------------------------------------------------
 $250,000 but less than $1 million      2.00%                   2.04%
--------------------------------------------------------------------------------------
 $1 million and over                      0                       0
--------------------------------------------------------------------------------------
</TABLE>

The reduced sales charge schedule is applicable to purchases of Class A shares
in a single transaction by:

- A single account (including an individual, trust or fiduciary account).

- Family member accounts (limited to husband, wife and children under the age of
  21).

- Pension, profit sharing or other employee benefit plans of companies and their
  affiliates.

- Tax-exempt organizations.

- Groups organized for a purpose other than to buy mutual fund shares.




14
<PAGE>   17


COMBINED PURCHASE PRIVILEGE. You also will have the benefit of reduced sales
charges by combining purchases of Class A shares of the Fund in a single
transaction with purchases of Class A shares of other Multi-Class Funds and
shares of FSC Funds.

RIGHT OF ACCUMULATION. You also may benefit from a reduction of sales charges,
if the cumulative net asset value of Class A shares of the Fund purchased in a
single transaction, together with shares of other Funds you currently own which
were previously purchased at a price including a front-end sales charge
(including shares acquired through reinvestment of distributions), amounts to
$25,000 or more. Also, if you have a cumulative net asset value of all your
Class A and Class D shares equal to at least $5 million (or $25 million for
certain employee benefit plans), you are eligible to purchase Class D shares of
any Fund subject to the Fund's minimum initial investment requirement.

You must notify your Morgan Stanley Dean Witter Financial Advisor or other
authorized financial representative, (or Morgan Stanley Dean Witter Trust FSB if
you purchase directly through the Fund) at the time a purchase order is placed,
that the purchase qualifies for the reduced sales charge under the Right of
Accumulation. Similar notification must be made in writing when an order is
placed by mail. The reduced sales charge will not be granted if: (i)
notification is not furnished at the time of the order; or (ii) a review of the
records of Dean Witter Reynolds or other authorized dealer of Fund shares or the
Fund's transfer agent does not confirm your represented holdings.

LETTER OF INTENT. The schedule of reduced sales charges for larger purchases
also will be available to you if you enter into a written "letter of intent." A
letter of intent provides for the purchase of Class A shares of the Fund or
other Multi-Class Funds or shares of FSC Funds within a thirteen-month period.
The initial purchase under a letter of intent must be at least 5% of the stated
investment goal. To determine the applicable sales charge reduction, you may
also include: (1) the cost of shares of other Morgan Stanley Dean Witter Funds
which were previously purchased at a price including a front-end sales charge
during the 90-day period prior to the distributor receiving the letter of
intent, and (2) the cost of shares of other funds you currently own acquired in
exchange for shares of funds purchased during that period at a price including a
front-end sales charge. You can obtain a letter of intent by contacting your
Morgan Stanley Dean Witter Financial Advisor or other authorized financial
representative, or by calling (800) 869-NEWS. If you do not achieve the stated
investment goal within the thirteen-month period, you are required to pay the
difference between the sales charges otherwise applicable and sales charges
actually paid, which may be deducted from your investment.

OTHER SALES CHARGE WAIVERS. In addition to investments of $1 million or more,
your purchase of Class A shares is not subject to a front-end sales charge (or a
CDSC upon sale) if your account qualifies under one of the following categories:

- A trust for which Morgan Stanley Dean Witter Trust FSB provides discretionary
  trustee services.





                                                                             15

<PAGE>   18


CONTINGENT DEFERRED
SALES CHARGE OR CDSC

A fee you pay when you sell shares of certain Morgan Stanley Dean Witter Funds
purchased without an initial sales charge. This fee declines the longer you hold
your shares as set forth in the table.



- Persons participating in a fee-based investment program (subject to all of its
  terms and conditions, including termination fees, mandatory sale or transfer
  restrictions on termination) approved by the Fund's distributor pursuant to
  which they pay an asset based fee for investment advisory, administrative
  and/or brokerage services.

- Employer-sponsored employee benefit plans, whether or not qualified under the
  Internal Revenue Code, for which Morgan Stanley Dean Witter Trust FSB serves
  as trustee or Morgan Stanley Dean Witter's Retirement Plan Services serves as
  recordkeeper under a written Recordkeeping Services Agreement ("MSDW Eligible
  Plans") which have at least 200 eligible employees.

- An MSDW Eligible Plan whose Class B shares have converted to Class A shares,
  regardless of the plan's asset size or number of eligible employees.

- A client of a Morgan Stanley Dean Witter Financial Advisor who joined us from
  another investment firm within six months prior to the date of purchase of
  Fund shares, and you used the proceeds from the sale of shares of a
  proprietary mutual fund of that Financial Advisor's previous firm that imposed
  either a front-end or deferred sales charge to purchase Class A shares,
  provided that: (1) you sold the shares not more than 60 days prior to
  purchase, and (2) the sale proceeds were maintained in the interim in cash or
  a money market fund.

- Current or retired Directors/Trustees of the Morgan Stanley Dean Witter Funds,
  such persons' spouses and children under the age of 21, and trust accounts for
  which any of such persons is a beneficiary.

- Current or retired directors, officers and employees of Morgan Stanley Dean
  Witter & Co. and any of its subsidiaries, such persons' spouses and children
  under the age of 21, and trust accounts for which any of such persons is a
  beneficiary.

 CLASS B SHARES  Class B shares are offered at net asset value with no initial
sales charge but are subject to a contingent deferred sales charge, or CDSC, as
set forth in the table below. For the purpose of calculating the CDSC, shares
are deemed to have been purchased on the last day of the month during which they
were purchased.

<TABLE>
<CAPTION>
YEAR SINCE PURCHASE                                         CDSC AS A PERCENTAGE
PAYMENT MADE                                                 OF AMOUNT REDEEMED
------------------------------------------------------------------------------------
<S>                                                         <C>
 First                                                          5.0%
------------------------------------------------------------------------------------
 Second                                                         4.0%
------------------------------------------------------------------------------------
 Third                                                          3.0%
------------------------------------------------------------------------------------
 Fourth                                                         2.0%
------------------------------------------------------------------------------------
 Fifth                                                          2.0%
------------------------------------------------------------------------------------
 Sixth                                                          1.0%
------------------------------------------------------------------------------------
 Seventh and thereafter                                         None
------------------------------------------------------------------------------------
</TABLE>

Each time you place an order to sell or exchange shares, shares with no CDSC
will be sold or exchanged first, then shares with the lowest CDSC will be sold
or exchanged next. For any shares subject to a CDSC, the CDSC will be assessed
on an amount equal to the lesser of the current market value or the cost of the
shares being sold.



16
<PAGE>   19



CDSC WAIVERS. A CDSC, if otherwise applicable, will be waived in the case of:

- Sales of shares held at the time you die or become disabled (within the
  definition in Section 72(m)(7) of the Internal Revenue Code which relates to
  the ability to engage in gainful employment), if the shares are: (i)
  registered either in your name (not a trust) or in the names of you and your
  spouse as joint tenants with right of survivorship; or (ii) held in a
  qualified corporate or self-employed retirement plan, IRA or 403(b) Custodial
  Account, provided in either case that the sale is requested within one year of
  your death or initial determination of disability.

- Sales in connection with the following retirement plan "distributions:" (i)
  lump-sum or other distributions from a qualified corporate or self-employed
  retirement plan following retirement (or, in the case of a "key employee" of a
  "top heavy" plan, following attainment of age 59 1/2); (ii) distributions from
  an IRA or 403(b) Custodial Account following attainment of age 59 1/2; or
  (iii) a tax-free return of an excess IRA contribution (a "distribution" does
  not include a direct transfer of IRA, 403(b) Custodial Account or retirement
  plan assets to a successor custodian or trustee).

- Sales of shares held for you as a participant in a MSDW Eligible Plan.

- Sales of shares in connection with the Systematic Withdrawal Plan of up to 12%
  annually of the value of each fund from which plan sales are made. The
  percentage is determined on the date you establish the Systematic Withdrawal
  Plan and based on the next calculated share price. You may have this CDSC
  waiver applied in amounts up to 1% per month, 3% per quarter, 6% semi-annually
  or 12% annually. Shares with no CDSC will be sold first, followed by those
  with the lowest CDSC. As such, the waiver benefit will be reduced by the
  amount of your shares that are not subject to a CDSC. If you suspend your
  participation in the plan, you may later resume plan payments without
  requiring a new determination of the account value for the 12% CDSC waiver.

- Sales of shares if you simultaneously invest the proceeds in the Investment
  Manager's mutual fund asset allocation program, pursuant to which investors
  pay an asset-based fee. Any shares you acquire in connection with the
  Investment Manager's mutual fund asset allocation program are subject to all
  of the terms and conditions of that program, including termination fees,
  mandatory sale or transfer restrictions on termination.

All waivers will be granted only following the Fund's distributor receiving
confirmation of your entitlement. If you believe you are eligible for a CDSC
waiver, please contact your Financial Advisor or call (800) 869-NEWS.

DISTRIBUTION FEE. Class B shares are subject to an annual 12b-1 fee of 1.0% of
the average daily net assets of Class B.

CONVERSION FEATURE. After ten (10) years, Class B shares will convert
automatically to Class A shares of the Fund with no initial sales charge. The
ten year period runs from the last day of the month in which the shares were
purchased, or in the case of Class B shares acquired through an exchange, from
the last day of the month in which the original Class B shares were purchased;
the shares will convert to Class A shares based on their relative net asset
values in the month following the




                                                                              17
<PAGE>   20



ten year period. At the same time, an equal proportion of Class B shares
acquired through automatically reinvested distributions will convert to Class A
shares on the same basis. (Class B shares acquired in exchange for shares of
another Morgan Stanley Dean Witter Fund originally purchased before May 1, 1997,
however, will convert to Class A shares in May 2007.)

In the case of Class B shares held in an MSDW Eligible Plan, the plan is treated
as a single investor and all Class B shares will convert to Class A shares on
the conversion date of the Class B shares of a Morgan Stanley Dean Witter Fund
purchased by that plan.

Currently, the Class B share conversion is not a taxable event; the conversion
feature may be cancelled if it is deemed a taxable event in the future by the
Internal Revenue Service.

If you exchange your Class B shares for shares of a Money Market Fund, a No-Load
Fund, North American Government Income Trust or Short-Term U.S. Treasury Trust,
the holding period for conversion is frozen as of the last day of the month of
the exchange and resumes on the last day of the month you exchange back into
Class B shares.

EXCHANGING SHARES SUBJECT TO A CDSC. There are special considerations when you
exchange Fund shares that are subject to a CDSC. When determining the length of
time you held the shares and the corresponding CDSC rate, any period (starting
at the end of the month) during which you held shares of a fund that does not
charge a CDSC will not be counted. Thus, in effect the "holding period" for
purposes of calculating the CDSC is frozen upon exchanging into a fund that does
not charge a CDSC.

For example, if you held Class B shares of the Fund for one year, exchanged to
Class B of another Morgan Stanley Dean Witter Multi-Class Fund for another year,
then sold your shares, a CDSC rate of 4% would be imposed on the shares based on
a two year holding period -- one year for each fund. However, if you had
exchanged the shares of the Fund for a Money Market Fund (which does not charge
a CDSC) instead of the Multi-Class Fund, then sold your shares, a CDSC rate of
5% would be imposed on the shares based on a one year holding period. The one
year in the Money Market Fund would not be counted. Nevertheless, if shares
subject to a CDSC are exchanged for a fund that does not charge a CDSC, you will
receive a credit when you sell the shares equal to the distribution (12b-1) fees
you paid on those shares while in that fund up to the amount of any applicable
CDSC.

In addition, shares that are exchanged into or from a Morgan Stanley Dean Witter
Fund subject to a higher CDSC rate will be subject to the higher rate, even if
the shares are re-exchanged into a fund with a lower CDSC rate.

CLASS C SHARES  Class C shares are sold at net asset value with no initial
sales charge but are subject to a CDSC of 1.0% on sales made within one year
after the last day of the month of purchase. The CDSC will be assessed in the
same manner and with the same CDSC waivers as with Class B shares.

DISTRIBUTION FEE. Class C shares are subject to an annual distribution (12b-1)
fee of up to 1.0% of the average daily net assets of that Class. The Class C
shares' distribution fee may cause that Class to have higher expenses and pay
lower dividends than Class A or Class D shares. Unlike Class B shares, Class C
shares have no conversion feature and, accordingly, an investor that purchases
Class C




18
<PAGE>   21



shares may be subject to distribution (12b-1) fees applicable to Class C shares
for an indefinite period.

 CLASS D SHARES  Class D shares are offered without any sales charge on
purchases or sales and without any distribution (12b-1) fee. Class D shares are
offered only to investors meeting an initial investment minimum of $5 million
($25 million for MSDW Eligible Plans) and the following categories of investors:

- Investors participating in the Investment Manager's mutual fund asset
  allocation program (subject to all of its terms and conditions, including
  termination fees, mandatory sale or transfer restrictions on termination)
  pursuant to which they pay an asset-based fee.

- Persons participating in a fee-based investment program (subject to all of its
  terms and conditions, including termination fees, mandatory sale or transfer
  restrictions on termination) approved by the Fund's distributor pursuant to
  which they pay an asset based fee for investment advisory, administrative
  and/or brokerage services.

- Employee benefit plans maintained by Morgan Stanley Dean Witter & Co. or any
  of its subsidiaries for the benefit of certain employees of Morgan Stanley
  Dean Witter & Co. and its subsidiaries.

- Certain unit investment trusts sponsored by Dean Witter Reynolds.

- Certain other open-end investment companies whose shares are distributed by
  the Fund's distributor.

- Investors who were shareholders of the Dean Witter Retirement Series on
  September 11, 1998 for additional purchases for their former Dean Witter
  Retirement Series accounts.

MEETING CLASS D ELIGIBILITY MINIMUMS. To meet the $5 million ($25 million for
MSDW Eligible Plans) initial investment to qualify to purchase Class D shares
you may combine: (1) purchases in a single transaction of Class D shares of the
Fund and other Morgan Stanley Dean Witter Multi-Class Funds; and/or (2) previous
purchases of Class A and Class D shares of Multi-Class Funds and shares of FSC
Funds you currently own, along with shares of Morgan Stanley Dean Witter Funds
you currently own that you acquired in exchange for those shares.

NO SALES CHARGES FOR REINVESTED CASH DISTRIBUTIONS  If you receive a cash
payment representing an income dividend or capital gain and you reinvest that
amount in the applicable Class of shares by returning the check within 30 days
of the payment date, the purchased shares would not be subject to an initial
sales charge or CDSC.

PLAN OF DISTRIBUTION (RULE 12B-1 FEES)  The Fund has adopted a Plan of
Distribution in accordance with Rule 12b-1 under the Investment Company Act of
1940 with respect to the distribution of Class A, Class B and Class C shares.
The Plan allows the Fund to pay distribution fees for the sale and distribution
of these shares. It also allows the Fund to pay for services to shareholders of
Class A, Class B and Class C shares. Because these fees are paid out of the
Fund's assets on an ongoing basis, over time these fees will increase the cost
of your investment in these Classes and may cost you more than paying other
types of sales charges.




                                                                              19
<PAGE>   22



FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Fund's
financial performance for the period July 29, 1998 (commencement of operations)
through May 31, 1999 and for the fiscal year ended May 31, 2000. Certain
information reflects financial results for a single Fund share. The total
returns in the table represent the rate an investor would have earned or lost on
an investment in the Fund (assuming reinvestment of all dividends and
distributions).

This information has been audited by PricewaterhouseCoopers, LLP, independent
accountants, whose report, along with the Fund's financial statements, is
included in the annual report, which is available upon request.

<TABLE>
<CAPTION>
CLASS A SHARES++
----------------------------------------------------------------------------------------------------------
                                                        FOR THE YEAR ENDED   FOR THE PERIOD JULY 29, 1998*
SELECTED PER-SHARE DATA                                    MAY 31, 2000          THROUGH MAY 31, 1999
----------------------------------------------------------------------------------------------------------
<S>                                                     <C>                  <C>
 Net asset value, beginning of period                         $11.76                    $10.00
--------------------------------------------------------------------------------------------------------------
 Income (loss) from investment operations:
   Net investment income (loss)                                (0.03)                     0.01
   Net realized and unrealized gain                             1.22                      1.75
--------------------------------------------------------------------------------------------------------------
 Total income from investment operations                        1.19                      1.76
--------------------------------------------------------------------------------------------------------------
 Less distributions from net realized gain                     (0.07)                       --

   Net asset value, end of period                             $12.88                    $11.76
==============================================================================================================
 TOTAL RETURN+                                                 10.12%                    17.60%(1)
--------------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS(3):
--------------------------------------------------------------------------------------------------------------
 Expenses                                                       1.29%                     1.38%(2)
--------------------------------------------------------------------------------------------------------------
 Net investment income (loss)                                  (0.25)%                    0.07%(2)
--------------------------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA:
--------------------------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                     $12,483                    $7,933
--------------------------------------------------------------------------------------------------------------
 Portfolio turnover rate                                         184%                       80%(1)
--------------------------------------------------------------------------------------------------------------
</TABLE>

*   Commencement of operations.

++  The per share amounts were computed using an average number of shares
    outstanding.

+   Does not reflect the deduction of sales charge. Calculated based on the net
    asset value as of the last business day of the period.

(1) Not annualized.

(2) Annualized.

(3) Reflects overall Fund ratios for investment income and non-class specific
    expenses.





20
<PAGE>   23



<TABLE>
<CAPTION>
CLASS B SHARES++
----------------------------------------------------------------------------------------------------------
                                                        FOR THE YEAR ENDED   FOR THE PERIOD JULY 29, 1998*
SELECTED PER-SHARE DATA                                    MAY 31, 2000          THROUGH MAY 31, 1999
--------------------------------------------------------------------------------------------------------------
<S>                                                     <C>                  <C>
 Net asset value, beginning of period                          $11.69                    $10.00
--------------------------------------------------------------------------------------------------------------
 Income (loss) from investment operations:
   Net investment loss                                          (0.12)                    (0.07)
   Net realized and unrealized gain                              1.21                      1.76
--------------------------------------------------------------------------------------------------------------
 Total income from investment operations                         1.09                      1.69
--------------------------------------------------------------------------------------------------------------
 Less distributions from net realized gain                      (0.07)                       --

   Net asset value, end of period                              $12.71                    $11.69
==============================================================================================================
 TOTAL RETURN+                                                   9.32%                    16.90%(1)
--------------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS(3):
--------------------------------------------------------------------------------------------------------------
 Expenses                                                        2.04%                     2.13%(2)
--------------------------------------------------------------------------------------------------------------
 Net investment loss                                            (1.00)%                   (0.68)%(2)
--------------------------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA:
--------------------------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                     $374,215                  $273,345
--------------------------------------------------------------------------------------------------------------
 Portfolio turnover rate                                          184%                       80%(1)
--------------------------------------------------------------------------------------------------------------
</TABLE>

*   Commencement of operations.

++  The per share amounts were computed using an average number of shares
    outstanding.

+   Does not reflect the deduction of sales charge. Calculated based on the net
    asset value as of the last business day of the period.

(1) Not annualized.

(2) Annualized.

(3) Reflects overall Fund ratios for investment income and non-class specific
    expenses.




                                                                              21
<PAGE>   24



<TABLE>
<CAPTION>
CLASS C SHARES++
------------------------------------------------------------------------------------------------------------------
                                                               FOR THE YEAR         FOR THE PERIOD JULY 29,
                                                                  ENDED                      1998*
SELECTED PER-SHARE DATA                                        MAY 31, 2000          THROUGH MAY 31, 1999
------------------------------------------------------------------------------------------------------------------
<S>                                                         <C>                  <C>
 Net asset value, beginning of period                             $11.70                     $10.00
------------------------------------------------------------------------------------------------------------------
 Income (loss) from investment operations:
   Net investment loss                                             (0.12)                     (0.04)
   Net realized and unrealized gain                                 1.22                       1.74
------------------------------------------------------------------------------------------------------------------
 Total income from investment operations                            1.10                       1.70
------------------------------------------------------------------------------------------------------------------
 Less distributions from net realized gain                         (0.07)                        --

   Net asset value, end of period                                 $12.73                     $11.70
===================================================================================================================
 TOTAL RETURN+                                                      9.31%                     17.10%(1)
------------------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS(3):
------------------------------------------------------------------------------------------------------------------
 Expenses                                                           2.04%                      1.91%(2)
------------------------------------------------------------------------------------------------------------------
 Net investment loss                                               (1.00)%                    (0.46)%(2)
------------------------------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA:
------------------------------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                         $24,711                    $15,744
------------------------------------------------------------------------------------------------------------------
 Portfolio turnover rate                                             184%                        80%(1)
------------------------------------------------------------------------------------------------------------------
</TABLE>

*   Commencement of operations.

++  The per share amounts were computed using an average number of shares
    outstanding.

+   Does not reflect the deduction of sales charge. Calculated based on the net
    asset value as of the last business day of the period.

(1) Not annualized.

(2) Annualized.

(3) Reflects overall Fund ratios for investment income and non-class specific
    expenses.



22
<PAGE>   25



<TABLE>
<CAPTION>
CLASS D SHARES++
--------------------------------------------------------------------------------------------------------------
                                                        FOR THE YEAR ENDED   FOR THE PERIOD JULY 29, 1998*
SELECTED PER-SHARE DATA                                    MAY 31, 2000          THROUGH MAY 31, 1999
--------------------------------------------------------------------------------------------------------------
<S>                                                     <C>                  <C>
 Net asset value, beginning of period                         $11.79                    $10.00
--------------------------------------------------------------------------------------------------------------
 Income (loss) from investment operations:
   Net investment loss                                         (0.01)                     0.03
   Net realized and unrealized gain                             1.24                      1.76
--------------------------------------------------------------------------------------------------------------
 Total income from investment operations                        1.23                      1.79
--------------------------------------------------------------------------------------------------------------
 Less distributions from net realized gain                     (0.07)                       --

   Net asset value, end of period                             $12.95                    $11.79
==============================================================================================================
 TOTAL RETURN+                                                 10.43%                    17.90%(1)
--------------------------------------------------------------------------------------------------------------
 RATIOS TO AVERAGE NET ASSETS(3):
--------------------------------------------------------------------------------------------------------------
 Expenses                                                       1.04%                     1.13%(2)
--------------------------------------------------------------------------------------------------------------
 Net investment income                                          0.00%                     0.32%(2)
--------------------------------------------------------------------------------------------------------------
 SUPPLEMENTAL DATA:
--------------------------------------------------------------------------------------------------------------
 Net assets, end of period, in thousands                      $5,339                       $69
--------------------------------------------------------------------------------------------------------------
 Portfolio turnover rate                                         184%                       80%(1)
--------------------------------------------------------------------------------------------------------------
</TABLE>

*   Commencement of operations.

++  The per share amounts were computed using an average number of shares
    outstanding.

+   Does not reflect the deduction of sales charge. Calculated based on the net
    asset value as of the last business day of the period.

(1) Not annualized.

(2) Annualized.

(3) Reflects overall Fund ratios for investment income and non-class specific
    expenses.




                                                                              23
<PAGE>   26



NOTES









24
<PAGE>   27

MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS

                            The Morgan Stanley Dean Witter Family of Funds
                            offers investors a wide range of investment choices.
                            Come on in and meet the family!

<TABLE>
<CAPTION>
<S>                                      <C>                                      <C>
 GROWTH FUNDS                            GROWTH FUNDS                             THEME FUNDS
                                         Aggressive Equity Fund                   Financial Services Trust
                                         American Opportunities Fund              Health Sciences Trust
                                         Capital Growth Securities                Information Fund
                                         Developing Growth Securities             Natural Resource Development
                                         Growth Fund                              Securities
                                         Market Leader Trust                      GLOBAL/INTERNATIONAL FUNDS
                                         Mid-Cap Equity Trust                     Competitive Edge Fund - "Best
                                         New Discoveries Fund                     Ideas" Portfolio
                                         Next Generation Trust                    European Growth Fund
                                         Small Cap Growth Fund                    Fund of Funds - International
                                         Special Value Fund                       Portfolio
                                         Tax-Managed Growth Fund                  International Fund
                                         21st Century Trend Fund                  International SmallCap Fund
                                                                                  Japan Fund
                                                                                  Latin American Growth Fund
                                                                                  Pacific Growth Fund

 GROWTH & INCOME FUNDS                   Balanced Growth Fund                     Total Market Index Fund
                                         Balanced Income Fund                     Total Return Trust
                                         Convertible Securities Trust             Value Fund
                                         Dividend Growth Securities               Value-Added Market Series/Equity
                                         Equity Fund                              Portfolio
                                         Fund of Funds - Domestic Portfolio       THEME FUNDS
                                         Income Builder Fund                      Real Estate Fund
                                         S&P 500 Index Fund                       Utilities Fund
                                         S&P 500 Select Fund                      GLOBAL FUNDS
                                         Strategist Fund                          Global Dividend Growth Securities
                                                                                  Global Utilities Fund

 INCOME FUNDS                            GOVERNMENT INCOME FUNDS                  GLOBAL INCOME FUNDS
                                         Federal Securities Trust                 North American Government Income
                                         Short-Term U.S. Treasury Trust           Trust
                                         U.S. Government Securities Trust         World Wide Income Trust
                                         DIVERSIFIED INCOME FUNDS                 TAX-FREE INCOME FUNDS
                                         Diversified Income Trust                 California Tax-Free Income Fund
                                         CORPORATE INCOME FUNDS                   Hawaii Municipal Trust(FSC)
                                         High Yield Securities                    Limited Term Municipal Trust(NL)
                                         Intermediate Income Securities           Multi-State Municipal Series
                                         Short-Term Bond Fund(NL)                 Trust(FSC)
                                                                                  New York Tax-Free Income Fund
                                                                                  Tax-Exempt Securities Trust

 MONEY MARKET FUNDS                      TAXABLE MONEY MARKET FUNDS               TAX-FREE MONEY MARKET FUNDS
                                         Liquid Asset Fund(MM)                    California Tax-Free Daily Income
                                         U.S. Government Money Market Trust(MM)   Trust(MM)
                                                                                  New York Municipal Money Market
                                                                                  Trust(MM)
                                                                                  Tax-Free Daily Income Trust(MM)
</TABLE>

There may be funds created after this Prospectus was published. Please consult
the inside back cover of a new fund's prospectus for its designations, e.g.,
Multi Class Fund or Money Market Fund.

Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
North American Government Income Trust and Short Term U.S. Treasury Trust, is a
Multi Class Fund. A Multi-Class Fund is a mutual fund offering multiple Classes
of shares. The other types of funds are: NL - No-Load (Mutual) Fund; MM - Money
Market Fund; FSC - A mutual fund sold with a front-end sales charge and a
distribution (12b-1) fee.
<PAGE>   28

MORGAN STANLEY DEAN WITTER
EQUITY FUND

Additional information about the Fund's investments is available in the Fund's
Annual and Semi-Annual Reports to Shareholders. In the Fund's Annual Report, you
will find a discussion of the market conditions and investment strategies that
significantly affected the Fund's performance during its last fiscal year. The
Fund's Statement of Additional Information also provides additional information
about the Fund. The Statement of Additional Information is incorporated herein
by reference (legally is part of this Prospectus). For a free copy of any of
these documents, to request other information about the Fund, or to make
shareholder inquiries, please call:

                                 (800) 869-NEWS

You also may obtain information about the Fund by calling your Morgan Stanley
Dean Witter Financial Advisor or by visiting our Internet site at:

                         WWW.MSDW.COM/INDIVIDUAL/FUNDS

Information about the Fund (including the Statement of Additional Information)
can be viewed and copied at the Securities and Exchange Commission's Public
Reference Room in Washington, DC. Information about the Reference Room's
operations may be obtained by calling the SEC at (202) 942-8090. Reports and
other information about the Fund are available on the EDGAR Database on the
SEC's Internet site (www.sec.gov), and copies of this information may be
obtained, after paying a duplicating fee, by electronic request at the following
E-mail address: [email protected], or by writing the Public Reference Section
of the SEC, Washington, DC 20549-0102.

                        (THE FUND'S INVESTMENT COMPANY ACT FILE NO. IS 811-8739)


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