Microsoft Office Outlook maintains everything in a data file, also called PST or OST file. It is an offline copy of mailbox data stored on a local PC. In case of issues, you must delete the data file ...
I have a file "␀gembench.st" which I used to use with an Atari ST emulator - the thing is I can't seem to be able to delete this puppy. I've tried the usually excellent program Permissions Reset .