Exchange Server 2010 SP1 Poison Mailbox Quarantine Feature
Topic Last Modified: 2010-10-15
The Microsoft Exchange Server Best Practices Analyzer Tool reads the following registry entry to determine whether a poison mailbox exists on the computer that is running Microsoft Exchange Server 2010:
HKLM\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<Server Name>\Private-{db guid}\QuarantinedMailboxes\{mailbox guid}
The following two conditions define a poison mailbox:
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A registry entry of CrashCount that has a value of 3 must exist.
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A registry entry of LastCrashTime that has a value of FILETIME < (current FILETIME + 6 hours) must exist.
If these conditions are true, the Analyzer tool generates a warning message.
In some cases, a single mailbox that has corrupted data (logical or physical) may cause the Exchange Store to crash, sometimes repeatedly. A poison mailbox may also deny service to all mailboxes that are hosted by the server.
For more information about the poison mailbox quarantine feature and about how to resolve this warning message, see the "Improvement to Store Health and Resilience" section in Understanding the Exchange 2010 Store.
