I doubt any hosting company will host 6.1 because it is no longer supported. The lowest you might find is 7 but if you do they are soon to move to 8 or 9 because of security and demand. I would figure out the difference between your 6.1 applications to version 8 or 9 to see if any tags were removed or replaced. You could always download a developer edition of 8 or 9 and test the websites to make sure they still work. There is also a code analyzer in the coldfusion admin under debugging and logging you can use to scan directories to find potential compatibility issues. So would look into using that. Hope this helps!
cfwebdeveloper
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