If VM is OS/2 the DB directory is in C:\avdap\
If VM is NT4 the DB directory could be in C:\avdap or D:\avdap

Yes to the keyboard & monitor. Mouse only in NT4 though.

Yes the mailboxes will be gone, as well as the greetings.

You'll really need to find out which VM it is before going further. The procedure is a bit different for each.

60% of the time it works every time