My laptop finally got to the point where the best course of action was to start from scratch with a fresh install of the OS and applications. Before I did this, I copied my Outlook.pst file to an external drive. I then reinstalled Windows Vista Premium (64 bit) and Office 2007 Professional.
I copied the pst file back in the local folder, then started up Outlook. Outlook ignored the Outlook.pst file already out there, and created another file Outlook1.pst and started receiving messages into it.
I keep copies of my messages out in my online mailbox. There are currently about 4000 messages out there. To stop Outlook from copying all of the messages into the new file, I pulled the network plug out of my laptop. I then made the older Outlook.pst the default file and deleted the Outlook1.pst file. Now when I started up Outlook again, I had the old messages out there, but when I reconnected to the internet Outlook began receiving all 4000 of the messages from the online mailbox. How can I stop this from happening? I know I can run an app to get rid of the duplicates, but is there a 'right' way to do this so I don't have to go through all of this aggravation?