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Event ID: 9531 Source: MSExchangeISMailboxStore

Starting cleanup of deleted mailboxes that are past the retention date on database First Storage Group\Mailbox Store (<server name>). For more information, click
By default, MS Exchange keeps the deleted mailboxes for 30 days. Once these time limit is passing, the deleted mailboxes are purged. This can be performed also manually.
When you delete a Mailbox in Exchange 2000 it is not removed immediately.  It is stored for 30 days and marked for retention.  This means you can get the mailbox back should you need to. Exchange will periodically try to clean out all the mailboxes marked for deletion and log 2 events in the Event Log which are 9531 and 9535. See ME274343 for more info.

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