As a consulting engineering firm, we do business with many architects using different software in differing versions. What ever the reasons, we have Revit projects in 3 different versions going on right now. This causes quite a bit of confusion. One thing we have done to help is to subdivide our local file folder into version years and change the default path in each version of Revit MEP to put local files under the correct year. See the screen shot below showing the 2010 pathing in use.
Mistake can still be made, but every little bit helps.