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Consider the following scenario.
The Microsoft Exchange Server 2007 organization is deployed for two or more domain trees within one forest.
For some reason, the domain controllers of one or more top-level domain are not reachable.
An Exchange administrator tries to create a new mailbox or checks existing mailbox properties in the Exchange Management Console.
In this scenario, the Exchange Management Console may crash.
Exchange Server 2007 holds a list of all top-level domains. When a top-level domain is not reachable, an unexpected exception occurs that causes the Exchange Management Console crash.
To resolve this problem, install Update Rollup 7 for Exchange 2007 Service Pack 1. For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: