To replace the default datafile, do the following:
1. Either create a new data (.pst) file or open your old data file that you want to have as your default. Save it wherever you like. (Use File -> New -> Outlook Data File or File -> Open -> Outlook Data File)
2. Go to Tools -> Email Accounts. Select “View or Change Existing Accounts”
3. On this page, you’ll see a drop-down: “Deliver new e-mail to the following location:” Select the new datafile that you want to use as your default.
4. You’ll be alerted that Outlook must be restarted. Go ahead and close Outlook, then re-open it. Your datafile should now be the default delivery location for email. You can right-click the old data file and close it if you like.
5. At this point, everything will work except that your contacts will not show up properly when you click the “To:” button. You need to re-link your contacts folder to the Address Book.
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What version of Outlook are you using?
The instructions I gave you might for a different version of Outlook. Microsoft made major changes to the GUI when they created Microsoft Office 2010. I can most likely give you different instructions if can tell me which version of Microsoft Outlook you are using.