I got error message from event viewer as follows after upgarde to SP2 1) Faulting application store.exe, version 6.5.7650.28, faulting module exchmem.dll, version 6.5.7638.1, fault address 0x000053b4. 2) Faulting application store.exe, version 6.5.7650.28, stamp 43dfe228, faulting module ntdll.dll, version 5.2.3790.3959, stamp 45d70ad8, debug? 0, fault address 0x0002be3e. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. 3) Unexpected error <<0xc1050000 - Network problems are preventing connection to the Microsoft Exchange Server computer. An unexpected, unknown error has occurred. Microsoft Exchange Server Information Store ID no: 80040115-0514-000006bf>> occurred. For more information, click http://www.microsoft.com/contentredirect.asp. It happen around one hour one time, do anyone know why ? thanks!!!

Hi, Please install the hotfix firstly to check whether the problem can be improved. http://support.microsoft.com/?id=938225 Mike

Problem had fixed.