Here are the most recent OCS-related KB articles published - enjoy!

http://support.microsoft.com/?kbid=943392
Error message when you try to send an instant message in Communications Server 2007: "The following message was not delivered to <recipient>"
11/14/2007
Windows NT
Office Comm Svr Ent 2007 EN
EN-US

http://support.microsoft.com/?kbid=943631
Error message when you try to view the events on the Event Log tab of the Communications Server 2007 MMC snap-in: "retrieving data failed"
11/14/2007
Windows NT
Office Comm Svr Ent 2007 EN
EN-US

http://support.microsoft.com/?kbid=943880
You may receive an access violation error message in the APIEM.DLL!WPP_SF_qSS call when you run a stack trace on a computer that is running Communications Server 2007
11/6/2007
Windows NT
Office Comm Svr Ent 2007 EN
EN-US

http://support.microsoft.com/?kbid=942872
Description of the Communications Server 2007 update package: November 2, 2007
11/6/2007
Windows NT
Office Comm Svr Ent 2007 EN
EN-US

- Michael Platts

  Support Escalation Engineer