If you’re worried about Microsoft’s 2011 Office Suite not working with Apple’s latest jungle cat, don’t sweat it. The guys and gals in Redmond have confirmed that both the 2011 and 2008 versions of Office are indeed fully compatible with the newly-released OS X Mountain Lion.
Microsoft wants its users to make sure Office for Mac’s AutoUpdate is enabled “to make the most of the upgrade to Mountain Lion” with future updates. Mountain Lion’s Gatekeeper security means that you’ll need to use Microsoft’s AutoUpdate tool to keep Office for Mac current.
Office for Mac 2011 has yet to be updated for the new MacBook Pro’s Retina display.
Apple sells its own iWork suite of productivity apps, including Pages, Numbers and Keynote, in the Mac App Store. They are Retina and iCloud-ready. But if you’re locked into using Office, rest assured that the 2011 and 2008 versions work on Mountain Lion.
Source: Office for Mac blog