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Q164564: XADM: How to Install Exchange 4.0 in an Exchange 5.0 Site

Article: Q164564
Product(s): Microsoft Exchange
Version(s): winnt:4.0,5.0
Operating System(s): 
Keyword(s): kbsetup kbusage
Last Modified: 05-MAY-1999

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The information in this article applies to:

- Microsoft Exchange Server, versions 4.0, 5.0 
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SUMMARY
=======

This article concerns a scenario in which you have an existing Microsoft
Exchange Server site and one of the servers in that Site is running Exchange
Server 5.0. This article tells you how to install Exchange Server 4.0 in an
Exchange Server site that contains an Exchange Server 5.0 computer or is in a
site connected to another site that contains an Exchange Server 5.0 computer.

MORE INFORMATION
================

The Support folder on the Exchange Server 5.0 CD contains an updated Setup.exe
file. Use this Setup.exe file when setting up Exchange Server 4.0 in a site that
contains an Exchange Server 5.0 computer. To set up Exchange Server 4.0:

1. Copy the Setup\<platform> (such as I386, Alpha, and so on) directory
  from the Exchange Server 4.0 CD to a blank directory on the hard disk drive.

2. Copy Support\Exch40\<platform>\Setup.exe from the Exchange Server 5.0
  CD to the directory that you created in step 1. This will overwrite the older
  Setup.exe file.

3. From the directory you created in step 1, run the new Setup.exe program that
  you copied in step 2.

These steps must be followed because when Exchange Server 5.0 is installed in a
Site with Exchange 4.0 Server computers, the schema of all the servers in that
site and all sites that have a Directory Replication Connector to that site will
be upgraded and the older version of Setup.exe will not work correctly.

Once this is done, installing Exchange Server 4.0 in that site will fail because
the Exchange Server 4.0 directory handle these new object types. Replication
with the other servers will fail, or the server will stop operating correctly.

The new version of Setup.exe supplied on the Exchange Server 5.0 CD was modified
so that the Exchange Server 4.0 can handle these new object types, allowing
Setup to work correctly.

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Keywords          : kbsetup kbusage 
Technology        : kbExchangeSearch kbExchange500 kbExchange400 kbZNotKeyword2
Version           : winnt:4.0,5.0
Issue type        : kbhowto

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