I once worked with a CIO that had a policy that we should be no more than one version behind current on software. The idea was that most vendors will have an e

I once worked with a CIO that had a policy that we should be no more than one version behind current on software. The idea was that most vendors will have an easy migration plan to current, but beyond that you usually had to upgrade twice with all the attendant pain. It's not fun, but as a consequence you don't get stuck with something that you absolutely can't maintain.