Old news but good news, I just wanted to make the post link for the latest build for Revit MEP 2010 called Update #1. You can download the build from here Revit MEP 2010 Update #1. Remember that when an update comes out for one version of Revit, example Revit MEP, that same day a the same build will come out for Revit Architecture and Revit Structure.
When collaborating on a project coordinate and discuss with the other disciplines to stay on the same year and build number.