Thank you for your advice. In the end i imported the address book and calendar from the old XP pst file into the Win 7 pst file. I couldn't figure out how to make the old pst the default data store. I have created 2 accounts and was surprised to find that each account has it's own pst file. This doesn't strike me as particularly useful and would prefer that both accounts use the same data source. Can this be done?