Last week I upgraded Office 2007 to 2010. I assumed that the current data file would be moved or renamed, but I cannot find it. When Outlook installed it automatically configured itself for IMAP, and I've always used POP3. Maybe that has something to do with it. At any rate, I am missing about three years' worth of e-mail. Granted, a lot of it is junk but there's that one e-mail one I'll really need that can't be found. It'll happen sooner or later. I'm wondering now if the new Outlook.pst overwrote the previous version when 2010 was installed. I've checked my most recent backup and that seems to be the case.
Any help is appreciated. Have a great day.