In case guide below about Scanpst will be ineffective, then you may refer to next links.... https://www.repairtoolbox.com/outlookrepair.html Outlook Repair Toolbox http://community.office365.com/en-us/f/172/t/262226.aspx http://www.answerbag.com/q_view/3169137 Outlook Inbox Repair Tool (Scanpst.exe) is a utility that you can use in this case to repair your damaged archive.pst. It is highly recommended that you backup the damaged PST first as running the tool can irreparably damage the file. 1. Quit the application 2. Scanpst.exe is a hidden file so make sure that the 'Show hidden files and folders' setting is enabled in the folder options 3. Click Start | Search, or Find and type 'Scanpst.exe' in the Search box 4. Double-click to open the file and browse to the location of your damaged archive.pst 5. Click 'Start' to start the recovery process 6. Try to open the file in question again. The corruption problem should not exist.