The Notes App is now gone from my Macbook Air. How do I get it back? The Notes app is now gone from my Macbook Air. It used to be in the doc and sync'd with my iPhone and iPad. Earlier today, I saw the icon still there, with a question mark on top of it, and I could not open the app. Now, there is just a question mark. How do I get the Notes App back on my Macbook Air?
The easiest thing to do might be to check in Lauchpad (the silver rocket in the dock or in /Applications ) to search for notes.

If it's still there, it just got moved, so you can search in Spotlight to find it.

If it's really gone, you can restore it using Time Machine or another backup. Worst case, you would have to re-install the OS but that might need some details about how you purchased Mountain Lion (whether it was an upgrade or came with the Mac for instance).