I installed Outlook 2010 on one PC. I decided to try to use a network location instead of the local PC for backup reasons. I know this didn't work well with earlier versions of Outlook. It ran fine for a few weeks and then I got a back-up error saying the PST file was corrupt. But the user was still working fine with his file. So I decided to move it back to the local PC today. So I copied the outlook file, renamed it, and placed it in the usual folder on the PC. Then I changed that file to the default file and also the folder where email is delivered. The next time I opened Outlook it opens and then starts to send/receive and errors and has to close. I have tried to change the default file back and create a new one. I get the same result. Not I have a user down.