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Event ID: 1009 Source: MSExchangePOP3

Number of simultaneous connections made by user <user name> exceeded maximum (16).
This can happen on Exchange 2007 SP1 due to a bug (the counter of POP3 connections does not decrease when a connection is disconnected). To resolve this problem, install Update Rollup 9 for Exchange 2007 Service Pack 1. See ME968626 for details.
This problem occurs if a deadlock occurs in the Microsoft.Exchange.POP3.exe process. In this situation, a client connection thread and a back-end proxy thread are pending for one another. Therefore, the existing connections are not disposed because the disposed threads are waiting for a resource that is held by the deadlocked threads. Eventually, the Exchange 2007 mail server reaches the connection limit. See ME932905 for information on how to resolve this problem.

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