This is what I mean: For example, I had Facetime on my current Macbook, and I used Migration Assistant to get all my apps from my Time Machine backup. In the Time Machine backup, the Facetime app is in it. Will the Migration Assistant replace the new Facetime in the Macbook with the old Facetime in the Time Macine Backup?? When I upgrade to Mac OS X Lion, I am planning to use Migration Assistant to get my old apps and files into Mac OS X Lion. Thanks.