Hi There, I have installed (tried to) SP2 for Exchange 2003 on a Windows 2003 Srv Std Ed. The install failed first because I had Intelligent Message Filter v1 installed. So I uninstalled it and rerun the SP2 setup program. It failed again on the "Microsoft Exchange Messaging and collaboration services" giving a red X next to name in the Task list, but the install continued. At the very end, it shows an error: ""0xc007041d - The service did not respond to the start or control request in a timely fashion (EXIFS) Facility: Microsoft Exchange Setup ID no: c107041d Microsoft Exchange Setup" Since then, no-one here can access their mailboxes online. I know I receive emails as some are forwarded to other external addresses, but emails do not get stored into users' mailboxes. Also the "Local Delivery" queue shows all email messages waiting to be delivered to the users' mailboxes, with a State of "Retry". The Mailbox Store in the first storage group is not accessible anymore. Gives an error ID: c1041721 about the service not running. I have googled extensively for these symptoms but can't find anything, and I cannot uninstall the damn SP2 (Exchange believes SP2 installed sucessfully!!!) I also tried installing SP1 on top of it but this also fails. Please help! Hedgehog.