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For that matter, I understand there to be several different ways of running ASP on Apache, each with their own quirks. I can't help much with those, since I don't do ASP and therefore have no experience with them, but I think it would be useful to anyone here who can help with that to know.
Now i think so i made clear, where i am struck.
Do you want to keep the DB on M$ SQL or migrate that as well? There's probably some reprogramming to do if you want to migrate, though switching between SQL servers is generally not too too hard.