This article was previously published under Q158308
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This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
Starting more than seven combined instances of the PCMTA, MSMI, IMC,Schedule+ Free & Busy Connector, MTA, or Directory Synchronization fails ona system running Windows NT 4.0 (or Windows NT 4.0 SP1) and MicrosoftExchange Server 4.0. Seven instances is generally the limit for runningthese services concurrently; however, this may vary, depending on the orderin which the services are started. The eighth instance generates an errorand it fails to start. The error message is as follows:
Initialization of the dynamic link library D:\WINNT\system32\USER32.dll has failed. The process is terminating abnormally.
This is followed by a second error message:
Could not start the <%insert service name here%> on <%computername%>. Error 2186: The service is not responding to the control function.
No event log errors are reported (with logging at maximum for MicrosoftExchange).
The system has run out of memory for creating a new desktop heap for theservice being started.
To fix this problem, edit the registry and restart the computer.
WARNING: Using Registry Editor incorrectly can cause serious problems thatmay require you to reinstall Windows NT. Microsoft cannot guarantee thatproblems resulting from the incorrect use of Registry Editor can be solved.Use Registry Editor at your own risk.
Start Registry Editor (Regedt32.exe).
Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey: