I have a computer that has Outlook 2010. There are 5 accounts on this Outlook. For some reason all of a sudden there is a new default data file which is Outlook.pst which is now causing all 5 accounts to show all e-mails of those 5 in all 5 accounts. I cannot get rid of this new "Outlook.pst" and I cannot make any other Data File the "Set as Default" These are all Imaps. Should I reinstall Outlook and make them Pops and import the correct data file to the correct e-amil account?