Per a thread on the OpsMgr email discussion list, the Exchange 2010 MP has been pulled due to a bug. Per a post to the thread by Pete Zerger, and a link, the reason is:
"The issue was that under specific conditions of low disk space on mailbox servers database volumes, it could cause a quarantine of mailboxes."
Microsoft is working on a fix.
Forum thread: Exch 2010 MP Pulled?
UPDATE: Full explanation is now posted on the Microsoft Exchange Team Blog: Mailboxes on a database are Quarantined in an environment with System Center Operations Manager

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