Very nice info, i needed it badly:) http://blogs.technet.com/ramo/archive/2008/07/08/how-to-enable-appear-offline-presence-status-in-office-communicator.aspx

For all of those in the Arabic countries, TechNet is in Arabic language now. Just visit http://technet.microsoft.com/ar-sa/default.aspx and you will find what you need.

DGoldman blogged a very important info about generation of warning (9359) on Exchange 2010 servers whenever you attempt to generate the OAB. The warning is: Log Name:    Application Source:         ...