Filed by EMC Corporation.
                      Pursuant to Rule 425 under the Securities Act of 1933
                                   and deemed filed pursuant to Rule 14a-12
                                     of the Securities Exchange Act of 1934
                                          Subject Company: Documentum, Inc.
                                              Commission File No. 000-27358


This filing relates to the proposed merger pursuant to the terms of that
certain Agreement and Plan of Merger, dated as of October 13, 2003 (the "Merger
Agreement"), by and among EMC Corporation ("EMC"), Elite Merger Corporation, a
wholly owned subsidiary of EMC, and Documentum, Inc. ("Documentum"). The Merger
Agreement is on file with the Securities and Exchange Commission as an exhibit
to the Current Report on Form 8-K filed by EMC on October 14, 2003, and is
incorporated by reference into this filing.



The following is a form of letter sent by EMC to Centera Partners.



Date

[Centera Partner Contact Name]
[Title]
[Company Name]
[Address]
[Address]

Dear [Name],

EMC announced on October 14, 2004 its plan to acquire Documentum. The
acquisition is expected to be completed in the first quarter of 2004.

[Centera Partner Company Name] is an important EMC partner and key component of
the EMC Centera Division's strategy to provide its customers with best-in-class
solutions for storing fixed content. The Centera CAS system is EMC's
fastest-growing product and its success to date can be attributed to its open
integration with best-in-class partner applications such as [Centera Partner's
Application].

This partner strategy of open integration is founded upon providing our joint
customers with tightly integrated solutions aimed directly at their business
requirements. EMC's acquisition of Documentum does not affect the overarching
partner strategy for EMC Centera and will not impact our ongoing partnership
moving forward.

We will contact you soon to provide you with further details and answer your
questions.


Sincerely,




ADDITIONAL INFORMATION AND WHERE TO FIND IT

In connection with the proposed transaction, EMC and Documentum intend to file
a proxy statement/prospectus with the U.S. Securities and Exchange Commission
(the "SEC"). Investors and security holders of EMC and Documentum are advised
to read the proxy statement/prospectus when it becomes available, because it
will contain important information about EMC, Documentum and the proposed
transaction. Investors and security holders may obtain a free copy of the proxy
statement/prospectus, when available, and other documents filed by EMC and
Documentum with the SEC at the SEC's website at www.sec.gov. Free copies of the
proxy statement/prospectus, when available, and each company's other filings
with the SEC also may be obtained from the respective companies. Free copies of
EMC' filings may be obtained by directing a request to EMC. You can request
this information via the web at www.EMC.com/IR/request or by sending a written
request to EMC Investor Relations, EMC Corporation, 176 South Street,
Hopkinton, MA 01748. Free copies of Documentum's filings may be obtained by
directing a request to Documentum Investor Relations, Documentum, Inc., 6801
Koll Center Parkway, Pleasanton, CA 94566. In addition, investors and security
holders may access copies of the documents filed with the SEC by EMC on EMC's
website at www.emc.com, and investors and security holders may access copies of
the documents filed with the SEC by Documentum on Documentum's website at
www.documentum.com.

Documentum, its directors and executive officers may be deemed to be
participants in the solicitation of proxies from Documentum stockholders in
favor of the proposed transaction. A description of the interests of the
directors and executive officers of Documentum is set forth in Documentum's
proxy statement for its 2003 annual meeting, which was filed with the
Securities and Exchange Commission on April 24, 2003. Investors and security
holders may obtain additional information regarding the interests of such
potential participants by reading the definitive proxy statement/ prospectus
and the other relevant documents filed with the Securities and Exchange
Commission when they become available.


                                      ###

FORWARD LOOKING STATEMENTS

This document contains "forward-looking statements" as defined under the
Federal Securities Laws. Actual results could differ materially from those
projected in the forward-looking statements as a result of certain risk
factors, including but not limited to: (i) risks associated with strategic
investments and acquisitions, including the challenges and costs of closing,
integration, restructuring and achieving anticipated synergies associated with
the announced plans to acquire LEGATO Systems, Inc. (Nasdaq: LGTO) and
Documentum, Inc.; (ii) adverse changes in general economic or market
conditions; (iii) delays or reductions in information technology spending; (iv)
the transition to new products, the uncertainty of customer acceptance of new
product offerings, and rapid technological and market change; (v) insufficient,
excess or obsolete inventory; (vi) competitive factors, including but not
limited to pricing pressures; (vii) component quality and availability; (viii)
the relative and varying rates of product price and component cost declines and
the volume and mixture of product and services revenues; (ix) war or acts of
terrorism; (x) the ability to attract and retain highly qualified employees;
(xi) fluctuating currency exchange rates; and (xii) other one-time events and
other important factors disclosed previously and from time to time in EMC's and
Documentum's filings with the U.S. Securities and Exchange Commission. EMC and
Documentum disclaim any obligation to update any such-forward looking
statements after the date of this document.