At times you may find that your Outlook .pst file have been corrupted and that you are unable to access them. Microsoft has provided the Inbox Repair Tool which lets you recover folders and items from corrupted Personal Folders or .pst files. It can even recover items from offline folder or .ost files.
The Inbox Repair Tool or Scanpst.exe is located in the C:\Program Files\Microsoft Office\Office14 folder. To run the tool type scanpst.exe in Start Search and hit Enter. In the space provided, enter the name and location of the file you want to scan and click Start.
The tool can recover the following personal folders:
- Deleted Items
- Sent Items
While the Inbox Repair Tools is quite easy to use, if you are too lazy to even do this, you can download and run Microsoft Fix It 50569 from KB272227. This Fix It will do the needful automatically.
A PST file has a 2-GB size limit. Once this limit is reached, corruption will start occurring. In such a case if the Inbox Repair Tool cannot fix the corruption, you can try to use the Oversized PST And OST Crop Utility or the PST2GB Tool from Microsoft first, and then again repeat the Inbox Repair Tool. This tool deletes 25 MB of data from the file to bring the file back within the allowed. While this tool was used in the earlier versions of Outlook, I am not sure about its use or applicability in the current Outlook version. So please read all the instructions and exercise utmost caution should you think you can and should run this tool. If you need more help on this, you may contact Microsoft Support.
OLFix may also interest you as it allows you repair more Outlook problems.
Hope this helps!