XADM: Error Message: An Unknown, Unexpected Error Has Occurred
Article ID: 174172
Article Last Modified on 10/28/2006
APPLIES TO
- Microsoft Exchange Server 5.0 Standard Edition
- Microsoft Exchange Server 5.5 Standard Edition
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:
- Rename Riched32.dll and Mapi32.dll in the winnt\system32 directory.
- Run Exchange Server Setup and choose Reinstall. If any Exchange service
packs were applied, they need to be reinstalled.
Keywords: kbusage KB174172