The new 11.6 inch Macbook Air has a 1366 X 768 resolution and the minimum system requirements for Office 2011 requires a 1200 X 800 resolution screen.
Office 2011 will install. Apple stores have it installed if you want to check it out. Be aware that the overall Mac Office ‘experience’ could be different on the lower resolution.
One user reported:
Excel opens a window that goes below the screen. Click the “+” button then . . .
Continue Reading: Office 2011 will install on new 11.6 inch Macbook Air