What I do when faced with this issue is select Import/Export, select the Personal Folder, select all subfolders, then export it to a Personal Folder and select the type which is just Personal Folder and not the Personal Folder (1997-2002). This will take a while to run, but it will copy the contents the newer format. After the export is done, unmount the older Personal Folder and then mount the newer version. -----Original Message----- From: MSU Network Administrators Group [mailto:[log in to unmask]] On Behalf Of Al Puzzuoli Sent: Monday, January 11, 2010 11:25 AM To: [log in to unmask] Subject: [MSUNAG] Upgrading a PST to Latest Version? One of my users has been archiving mail to the same PST for years. Today, he got a message indicating that he has reached the maximum storage limit for the PST, and that he should upgrade the PST to the Office 2003 format. I'm not sure which version of office this PST was initially created in, but we're now running Office 2007. How do we go about converting this pST to the most current format? Thanks, --Al