After installing Mountain Lion, my Microsoft Office Suite would not open. I found this post, but don't understand it:
There is actually a fix for this. Check the individual OS forums - many people had this problem with the recent security update. If you installed the security update, make sure you do an software update again.
What is "individual OS forums" and how can I find this security update / software update so I can open my apps again?
BTW: After installing Mountain Lion, I got this message when I tried to open up Word or Excel: "power PC applications are no longer supported."