After you upgrade a Microsoft Windows NT 4.0-based computer to Microsoft Windows 2000 and Exchange 2000 Server, Exchange System Attendant may not start. When you try to start Exchange System Attendant, you may receive the following error messages:
EVENT ID 7023. The Microsoft Exchange Routing Engine service terminated with the following error: Access is denied.
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EVENT ID 7001. The Microsoft Exchange MTA Stacks service depends on the Microsoft Exchange System Attendant service, which failed to start because of the following error: Access is denied.
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EVENT ID 7000. The Microsoft Exchange System Attendant service failed to start due to the following error: Access is denied.
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EVENT ID 562. SMTP could not load Advanced queuing DLL.