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.
RESOLUTION
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.
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.
Check the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Clients\Extensions
One of the two following keys should exist:
Internet Mail with a String value of "4.0;minet32.dll;2;;;IMAIL"
InternetMail with a String value of "4.0;minet32.dll;2;;;;IMAIL"
If neither entry exists, add one. In Windows NT, the value should be type
REG_SZ instead of String.
If duplicate entries exist, remove one of them.