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If you are using (relying upon) PWS with your windows 98, you will want Pro. Pro has IIS, home does not. PWS does not operate on XP.
Obviously, you can figure out a method to get around anything, but out of the box, Pro doesn't require any changes to be up and running with a local version of IIS.
roblaw
Funny story: I bought a laptop with XP Home from Dell a while back. When I got it, I realized that PWS wouldn't operate and there wasn't a simple alternative. The upgrade price would have been $79 at the time of purchase. I called Dell and asked if they would sell me XP Pro for the $79 price as if I bought it with the system and the woman on the phone said they couldn't, but they could provide me with a $200 voucher so that I could buy it myself. I let her know that it was my mistake for not looking into the differences when I ordered. She said that was OK and sent me the $200 credit to use. They must have had a top line number to reach that quarter!