Question is once I start the application backup from the application pool , do I need to restart the IIS serverices? issreset ? Event Type: Warning Event Source: W3SVC Event Category: None Event ID: 1009 Date: 8/29/2011 Time: 3:27:09 AM User: N/A Computer: Description: A process serving application pool 'MSExchangeSyncAppPool' terminated unexpectedly. The process id was '6848'. The process exit code was '0xffffffff'. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Event Type: Error Event Source: W3SVC Event Category: None Event ID: 1002 Date: 8/29/2011 Time: 3:27:09 AM User: N/A Computer: Description: Application pool 'MSExchangeSyncAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

Hi GregDrog, Which service pack and Rollup of Exchange 2007? suggest you install latest service pack and rollup first: About the error, please see: The MSExchangeSyncAppPool application pool crashes on a server that hosts an Exchange Server 2007 Client Access Server role http://support.microsoft.com/kb/948830 Frank Wang Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

Hi GregDrog, Any updates? Frank Wang

We contacted microsoft and they resolved it by capturing the crash and analyzing the dump.