.net framework 3.5 & up

We are currently using .net framework 3.5 and we want to install 4.0 and 4.5 on Windows 2008 server. What I don't under is, is it going to replace .net framework 3.5 or both can co exist?
VBdotnet2005Asked:
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kaufmed   ( ⚆ _ ⚆ )Patches? We Ain't Got No Patches! We Don't Need No Patches! I Don't Have to Push You No Stinkin' Patches!Commented:
No it will not replace it. .NET 3.5 and 4.0 are separate version of the Framework. However, .NET 4.5 is a modification of the 4.0 Framework, and it will overwrite a subset of 4.0's files.

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Dave BaldwinFixer of ProblemsCommented:
Here http://msdn.microsoft.com/en-us/library/bb822049%28v=vs.110%29.aspx is a table that shows what you can install on different versions of Windows and Visual Studio.
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Windows Server 2008

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