Location: Outlook Pst File

If you are looking for an OST file instead of a PST file, the location is slightly different.

Furthermore, users who store PSTs on network drives or external USB drives face additional risks. A momentary network disconnect or removing a USB drive without "ejecting" can instantly corrupt the file, requiring the use of the dreaded ScanPST.exe (Inbox Repair Tool). Microsoft officially does not support PST files on network shares due to this inherent instability. outlook pst file location