The majority of times we have not had specific issues with the various versions of dot net coexisting on a single machine. In IIS different application pools are needed to run net 1.1 and net 2.0.web applications. One other issue we have found is that simply installing net 4.00 can lead to the occasional referencing errors concerning net 3.5 and net 3.5 sp1. We therefore recoomend that the various versions of the dot net framework are installed in numeric sequential order. Microsoft had various catchy urls for these downloads. For the sake of convenience they are listed below:
Microsoft .NET Framework Versions:
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5&displaylang=en
2.0
http://www.microsoft.com/downloads/en/details.aspx?FamilyId=333325fd-ae52-4e35-b531-508d977d32a6&displaylang=en
3.5
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7&displaylang=en
3.5 sp1
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992&displaylang=en
4.0
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