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On a Microsoft Exchange 2007 server, the Microsoft Exchange Information Store service stops responding intermittently. When this problem occurs, RPC connections begin to be consumed until clients can no longer connect to the Exchange server.
This issue occurs because of a deadlock in the Store.exe process.
To resolve this problem, install Update Rollup 8 for Exchange 2007 Service Pack 1. For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: