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It might work on Windows 7. Just boot up the laptop with the external monitor connected. Give it enough time to full boot, then hit Windows + P. There are multiple options Extend, Duplicate, External only. So hit the P, 1/2/3 times and see if anything happens.

FYI, if you use Outlook for your email, you don't have to export the pst. Outlook by default stores all the info in a PST unless you are connected to an exchange server, but you wouldn't be worried about your email if you had Exchange. You just need to go to where your .pst is stored, should be here

If it is a Windows 10 machine hit the Windows + P keys to extend to the external monitor.