He's already unemployable, even if he does have a job. He's a bloody menace. Possibly also an incompetent and a liar.
Outlook, like IE has an "Export files and settings" setting. You can copy the emails, folders, colour settings, personal preferences and whatnot to another machine, to an online cache or to some other software like Thunderbird or Pegasus, just like IE can export to disk, online or Firefox or Chrome. The Help file and the online Microsoft help pages are *excellent* in showing us how to do this. Years ago, they were well known for being rubbish but this has not been the case for several years.
Where the files are is irrelevant. The *software* knows where they live so *it* can find and copy them. Anyone who has ever used MS Office for more than a minute would know this.
A small point, Rick, did you have any personal data on that drive, like credit card numbers, purchase receipts, addresses, email contacts, photographs or anything else? If so the ****** has probably lifted them, assuming he's competent enough to know how - which I would tend to doubt.
Were that me, I would have sued the thieving scunner within an inch of his life and included the company he worked for. Such blatant incompetence, idiocy , laziness, thievery or all four should never be tolerated.
Of course, I would have cleaned the drive before sending it in, so the question would never have arisen. But, unlike Rick's "geek", I'm a professional.