I have Office 2007 and recently upgraded to the trial version of Office 2010. I did not like it, uninstalled it and reinstalled Office 2007. When I attempted to open the PSTs that I had been using, I received an error message stating that their may be a problem with my mail profile which had been created using a newer version of Outlook. If so, I should add a new one using the Control Panel, which I eventually did and deleted the old one. I believe that everything seemed to be working until I added several contact directories to my Outlook Address Book. At that point, every time I tried to open or preview an email in any of the PSTs, Outlook would crash and restart the first time and then simply crash the second time. Oddly enough, I am able to see the texts of the mails by Replying to them. I cannot access any of my thousands and thousands of archived and categorized emails. I've run the Inbox Repair Tool many times and it has no effect. Can someone tell me how to fix this?