OCS 2007 R2 (Client Side - Office Communicator) - January 2010 - 3.5.6907.83

This update (KB 976135) contains the following fixes:

KB 978161 - Office Communicator 2007 R2 crashes when you receive an incoming instant message notification

KB 978162 - A hyperlink is converted to plain text format when you input the hyperlink into an Office Communicator 2007 R2 conversation window

KB 978163 - You cannot call a user by using the Actions button in Office Outlook 2007, but you can call the user through Office Communicator 2007 R2

You can download the update here.

I'm not sure if this client update addresses the compact delta GAL/stale GAL problem mentioned here yet or not.

Update: I had the version wrong in the title originally and a few new discoveries have surfaced. This version has the proper 64-bit MAPI/EWS/API support for 64-bit Office 2010, which means that Outlook integration (missed call notification, voice mail notification, "In a meeting" status) works for people brave enough (like me) to go completely 64-bit with Office 2010.

Also of note, which might be a side effect of the new 64-bit support, the client is now reporting "x64" instead of "x32" to the OCS Client Filter, as already noted numerous places. Read more about it here and here. For now, it is best just to duplicate your "x32" directory structure as "x64" until a "real" x64 client is available with patches or further guidance is provided from MS. I'm going to update my Client Filter post to reflect this shortly too.