I have a user who came in today and found that all of her mail was gone from Outlook 2003. I searched her machine for a .pst and found it in the default folder but when I tried adding it back to Outlook for her to retreive her mail it didn't recognize that there was even a .pst there. I checked the size of the .pst and it's at 62 MB so it's big but not huge. I tried running a SCAPST on it anyway and I browsed to the desktop (where I moved the .pst to for now) and there was no .pst there. Do any of you have any ideas on how to get Outlook to recognize this file as a PST becasue now in properties it states it's an, "Office Data File," but Opens with an, "Unknown application." She is at a work stoppage until I can get this so any advice would be greatful. I just went into the properties and changed the application from, "Unknown," to, "Microsoft Office Outlook," and it still didn't recognize it as a PST when I tried adding it to Outlook even after I rebooted.