When you view the Internet Mail Service properties in Microsoft Exchange
Server 5.0 administrative tools after adding a version 5.5 server to a site
that contains only version 5.0 server, you may receive the following error
message:
Extension 'SMTP' could not be loaded.
An error occurred during file replication. Unable to find the
extension .DLL file with the correct version number. To view details
of the error, see the application event log in the Windows NT Event
Viewer on the Microsoft Exchange Server computer.
Microsoft Exchange Administrator
ID no:c1030ad1
The event log may contain the following error:
Event ID - 2037
The file version of '\add-ins\SMTP\i386\imcadmin.dll' installed on
the local server is not current. Unable to locate a correct version
on any server in the site.