Ok I've progressed on this somewhat, but still am short of actually restoring the mailbox. Probably severe overkill here, but I've built an NT4 PDC, W2K server running Backup Exec 10d, and a W2K server running Exch 5.5.
1) The Exchange server is named the same as the server the mailbox was backed up on. It was built and all installed using 1 designated admin account e.g. 'harry'.
2) The Backup exec server was built and installed using the same domain admin account as above (i.e. 'harry').
3) The PDC itself, was built and 'harry' added to the administrators group.
So when running the restore, it comes up with this in the job log:
"Final error: 0x000848c - Unable to attach to a resource. Make sure that all selected resources exist and are online, and try again."
I'm wondering if its the Exchange server - i.e. what Exchange services should I be running, and which shoudl I have 'stopped'?
Help appreciated. Thanks again guys.