OK, I've done some testing, and here's what I've found:
kb961752 (outlook.msp) is causing the unknown sender problem
The problem is common to zco versions 5.0.10 and 5.0.15.
(Tested with both 5.0.2767.10 and 5.0.2931.15 against two zimbra servers of corresponding versions)
I believe kb961752 is what introduces the faster startup and shutdown, and also fixes the recurring data file not closed properly error, among other things.
The other outlook specific patch in SP2, kb967688 did not cause this problem. I tested with each patch individually present and both together, and it always arose with kb961752. Has anyone submitted a bug report on this yet?
Last edited by santillr; 04-09-2009 at 08:22 AM..
Reason: Clarification
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