I backed up my .pst folder onto a DVD disc (with other data) and re-formatted my machine. I've finished re-installing everything, including an upgrade to Outlook 2003.

When importing/opening/adding my .pst file I get an error suggesting to me that the .pst file is "not a personal folders file". The file is over 80Mb, and password protected.

I tried it in my older version of Outlook 2000 and the same error. The data on the DVD backup all works; so I don't believe the data is "corrupt"...though it might be?

I have tried Outlook Inbox Repair Tool - but it too doesn't recognise the .pst file as a valid file.

Help?