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Then search in bugzilla, if you can't find it then file a bug entry. You don't know that the already filed bug is an exact duplicate of one you've experienced.
Acompli: A new adventure for Co-Founder KevinH.
See my post here to recover from this:
bug 7725 involved a network only component.
the zimbra.logs (if still around) should give some clues about what was happening. does this return anything:
grep deadlock /opt/zimbra/tomcat/logs/stacktrace.*
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