XADM: Error Message: An Unknown, Unexpected Error Has Occurred (174172)


The information in this article applies to:

  • Microsoft Exchange Server 5.0
  • Microsoft Exchange Server 5.5
This article was previously published under Q174172

SYMPTOMS

When you start the Exchange Administrator program, the following error message may appear:
An unknown, unexpected error has occurred.
MAPI or an unspecified service provider
ID no. 0000000-0000-00000000

CAUSE

This may be due to an incorrect version of Riched32.dll or Mapi32.dll in the system32 directory on this computer. This problem may occur if the system has been downgraded to a previous version of Exchange. Setup will not overwrite newer files, and because the newer DLL file is not backward compatible, this error will occur.

RESOLUTION

To resolve this problem, do the following:

  1. Rename Riched32.dll and Mapi32.dll in the winnt\system32 directory.
  2. Run Exchange Server Setup and choose Reinstall. If any Exchange service packs were applied, they need to be reinstalled.
Modification Type:MinorLast Reviewed:4/28/2005
Keywords:kbusage KB174172
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