I recently had to call Microsoft Office for Mac support this morning because of the 14.2.4 update not working. I stayed on the phone for several hours with a very nice lady and she helped me do the normal trouble shoot problems for this issue. Unfortunately, in this case, the trouble shoot did not work and after getting a research technician we came to the conclusion that I would have to wait for the next update and that this is a problem that Apple and Microsoft are trying to resolve. I am using an early 2011 Macbook Pro i5 with 8gb of ram running Mountain Lion 10.8.2. NOTE: The Microsoft Office applications are all fully functional, I just am unable to update. Also if your Microsoft Word application says 14.2.4 but the latest installed is 14.2.3 and the rest of the Office applications say 14.2.3 for the version and latest installed, then your Microsoft Office will be unable to update to the 14.2.4 update.