If you receive error 0x80072F06 when synchronizing windows mobile 6.0 or 6.1 with exchange, try to disable SSL and see if it works – go to Hkey_Current_User\Software\Microsoft\ActiveSync\Partners , then go to folder UID_Server_partnership where UID is the id of the server (you can see which one is the real one by checking Name key in the folders, should be Microsoft Exchange) and change the value of UseSSL to 0. Unsecure, but it at least works. Or, ask the exchange administrator to create a normal SSL key :)