The following errors may be logged in an environment that has been upgraded to a new version of Exchange (usually 2003 to 2010), or a service pack to Exchange (2010) has been installed.

MSExchange ADAccess Event ID 2937
Log Name: Application
Source: MSExchange ADAccess
Date: 9/26/2010 9:12:29 AM
Event ID: 2937
Task Category: Validation
Level: Warning
Keywords: Classic
User: N/A
Computer: server.contoso.com

The reason for this error is that an AD attribute of an item (e.g. mailbox, connector, routing group, etc) is pointing to the DN of a server which has recently been deleted from AD. As long as the object is still physically present in   ...