Microsoft KB Archive/136804

= XCLN: Loading/Disabling MS Mail 3.x Win Client Extensions =

Article ID: 136804

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Client 5.5
 * Microsoft Exchange Client 5.0
 * Microsoft Exchange Client 4.0
 * Microsoft Exchange Client 5.0

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This article was previously published under Q136804





SUMMARY
The Microsoft Exchange Windows client can load Microsoft Mail for Windows, version 3.x, client extensions.

This article describes how to load (or exclude) Microsoft Mail 3.x Windows client extensions into Microsoft Exchange Windows clients.



MORE INFORMATION
IMPORTANT: This article contains information about editing the registry. Before you edit the registry, you should first make a backup copy of the registry files (System.dat and User.dat). Both are hidden files in the Windows folder.

The Microsoft Exchange Windows clients can read the Msmail.ini file and automatically load the client extensions listed in that file.

Certain Microsoft Mail client extensions can be excluded from Microsoft Exchange by adding the tag of the extension to a list of tags to be excluded. On Windows 95 and Windows NT, the list of tags is specified in the registry key:

  HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Client\ Options\ExcludeCustomKeys

NOTE: For information about how to edit the registry, view the Changing Keys And Values online Help topic in Registry Editor (Regedit.exe). Note that you should make a backup copy of the registry files (System.dat and User.dat) before you edit the registry.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows 95. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

On Windows 3.x, the list of tags is specified in the EXCHNG.INI file. The ExcludeCustomKeys entry in the Options section specifies the list of tags to be excluded.

For example, the following two custom extensions were defined in the MSMAIL.INI file.

  Sample1=3.0;File;Edit MSMAIL.&INI...;8;APPEXEC.DLL;NOTEPAD.EXE MSMAIL.INI;; Displays MSMAIL.INI;;;

Sample2=3.0;File;Edit WIN.&INI...;8;APPEXEC.DLL;NOTEPAD.EXE WIN.INI;; Displays WIN.INI;;;

If you wanted to exclude these two extensions from Microsoft Exchange, you could either delete the above lines from Msmail.ini or you could add the tags for the extensions to the list of excluded tags in the following manner:

  Sample1;Sample2

By default, when the clients are installed the following tags are added to the list of extensions to be excluded. These extensions have been found to be incompatible with the Microsoft Exchange Client.

  FaxSep1;IMEX;SP0;SP1;WinRules0

Keywords: KB136804

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