Move it (and all the subdirectories) to a new location which is shared with "Full Control". Double click ServerPath and change it to the new WGPO location. If you have WFWG or W95 users, change the ServerPath= in their MSMAIL.INI.
Key: Software\Microsoft\Mail\Microsoft Mail
Value: Change to new WGPO location
To start over(delete it): Delete the WGPO directory and delete the Microsoft Mail Sub Key.