Particular software could be (likely are) tied to particular versions.
Much like the way .NET is too.
So in that respect, I'd just leave them.
(And update them should, when, MS puts out updates for them
.)
Though I am kind of confused why you have 2008's in triplicate?
(I only have 2005's & 2010's. Seemingly that's all I've needed, so far.)