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I have a new installed w2kr2 with asp.net4 - some users need 3.5 - can I install that without problems and have both versions running?

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I'm assuming you mean Server 2008, since Server 2000 doesn't support .net4 – DanBig May 3 '11 at 12:46

You can have multiple different .net frameworks installed with no ill effect. We have an apps that require both 3.5 sp1 and 4 on the same server 2008 box, and everything works just fine together.

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