If I remember correctly, someone posted an activation code for Virtual PC 5.1 for OS/2 in the OS/2 newsgroups after support for it was dropped. Searching newsgroups via Google Groups might find the post (I never saved it, as virtual PCs were well over my head - I had and still have problems with my due to my limited knowledge.) When I have time, I'll try another search - I just tried, but there are far too many things found for me to look at now. If someone else looks and finds the post before me, they can post the url.
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AlanNerve Center BBS tncbbs.no-ip.com FidoNet 1:261/1000