Off the top of your head, what side effects do you already anticipate, specifically? Also, I think Rich makes a good point about the "free" Microsoft VS2005 Express Edition, but I don't know how much more of a pain it would be to target that, or if it would cause long-term issues or detriment to the progress.
IIRC there might also be some runtime issues since VS2005 links with some shared libs which may not be installed on older systems, so we need to verify this...
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