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XADM: Cannot Install Exchange 5.5 After Installing CDO 1.21

The information in this article applies to:

Microsoft Exchange Server, version 5.5
Collaboration Data Objects (CDO), version 1.21

SYMPTOMS

When you attempt to install Microsoft Exchange Server 5.5 on a computer on which Collaboration Data Objects (CDO) version 1.21 is installed, the following error messages may be displayed and the installation process may not complete successfully:

Self registration of the DLL c:\exchsrvr\bin\cdohtml.dll failed.

The specified procedure could not be found.

CAUSE

When you install CDO 1.21, an updated version of the Cdohtml.dll file is installed on your hard disk. The Exchange Server 5.5 installation program is unable to update this version of the Cdohtml.dll file.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5. This problem has been corrected in the latest U.S. service pack for Microsoft Exchange Server version 5.5. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

MORE INFORMATION

After you apply the fix, you must restart your computer before attempting to install Exchange Server 5.5 again.

Keywords          : XADM 
Version           : WINDOWS:1.21,5.5
Platform          : winnt 
Issue type        : kbbug