I have had some trouble with Outlook 2007 freezing when I go to the calendar. I can usually fix that by running scanpst. However, now I suddenly have multiple pst files with the "same" name and I don't know what to do about it. I would like to delete the unnecessary ones but, obviously, don't want to delete anything important.

For example... I now have Outlook, Outlook backup, Outlook1, Outlook2, Outlook3, and Outlook4. They are ALL different sizes...
What the heck is this all about and how do I determine what I can delete and what I can't? Help!!

OS is Windows7-64; Office is 2007 Pro.

Thanks!