13 October 2026, 07:42 PM
If you've ever opened Outlook and watched it freeze, or been told that your PST file can't be opened, you know the sinking feeling. Years of emails, attachments, calendars and contacts can sit inside one single file, so when that file gets damaged, it feels like everything is at risk. The good news is that in many cases the data is still there. The bad news is that a few wrong moves can turn a recoverable file into an unrecoverable one.
How people usually run into this: the trouble tends to start after a sudden power cut, a forced shutdown, Outlook being closed while it was still writing to the file, or a PST that has simply grown too large. Others keep the file on a USB drive or a network share that drops the connection. Often the first sign is a vague message like "the file is not an Outlook data file", folders going missing, search returning nothing, or Outlook getting stuck on "loading profile".
What you can try for free, in a sensible order:
Common mistakes that make things worse:
If the built-in tool fails, or the file is large or badly damaged, a dedicated utility like the Kernel Outlook PST Repair Tool can repair corrupt or oversized PST files, recover deleted emails, and show a preview before you save anything. The free trial saves the first 25 items per folder, so you can test it first:
Curious to hear what has worked for you. Did scanpst fix it, or did you have to try something else?
How people usually run into this: the trouble tends to start after a sudden power cut, a forced shutdown, Outlook being closed while it was still writing to the file, or a PST that has simply grown too large. Others keep the file on a USB drive or a network share that drops the connection. Often the first sign is a vague message like "the file is not an Outlook data file", folders going missing, search returning nothing, or Outlook getting stuck on "loading profile".
What you can try for free, in a sensible order:
- Before anything else, copy the PST file to a safe location. Every repair attempt should happen on the copy, never on the only original.
- Check the drive holding the file for errors using chkdsk. If the disk itself is failing, any repair will only be temporary.
- Close Outlook completely and run Microsoft's Inbox Repair Tool (scanpst.exe) on the copy. The exact location depends on your Office version. Choose the backup option, run the repair, then open Outlook and look inside the "Recovered Personal Folders" folder for any items it rescued.
- If the mailbox is an Exchange, Microsoft 365 or IMAP account, create a new Outlook profile and add the account again. Your mail may still be safe on the server, so no repair is needed at all.
- Look for older copies in Windows File History, a system backup, or OneDrive version history.
- Once you recover what you can, import it into a brand new PST file instead of carrying on with the damaged one.
Common mistakes that make things worse:
- Running the repair on the only copy of the file, with no way back.
- Running scanpst again and again, since each pass can discard more items.
- Repairing while Outlook is still open, or while the file sits in a cloud-synced or network folder.
- Ignoring the "Recovered Personal Folders" folder and assuming the emails are gone.
- Continuing to use the repaired file long term instead of moving the data to a clean one.
- Overlooking size limits, especially on older ANSI-format PST files.
If the built-in tool fails, or the file is large or badly damaged, a dedicated utility like the Kernel Outlook PST Repair Tool can repair corrupt or oversized PST files, recover deleted emails, and show a preview before you save anything. The free trial saves the first 25 items per folder, so you can test it first:
Curious to hear what has worked for you. Did scanpst fix it, or did you have to try something else?