In many cases, admins have to keep old versions around because new versions can break old apps. It isn’t unusual to find Windows PCs running three or more different copies of .Net Framework. I’ve seen versions 1.1, 2.0 SP 1, 2.0 SP 2, 3.0, 3.0 SP 2, 3.5, 3.5 SP 1, 4 ...
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