You can open any .pst file with the File | Open | Outlook Data File command.
Then make that the default. The details depend on the version of Outlook.

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Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Dave,
> did you get an answer for this? I have a problem where my default PST file has changed and along with it my old contact list! How do you change your
default PST file so that I can get my contact list back?