Made big-time mistake. Had a user which I deleted from AD and Exchange 2003, then recreated the same user. In turn, upon login to the domain, a new profile was created on the XP machine. Copied the OST from the old profile to the new profile, then opened Outlook 2007 and got an error that the OST could not be opened because the user's name is incorrect. How can I "convert" or "migrate" an OST file to a PST file so that I can import the user's email to new profile? Many thanks for your help...I really messed this up.