Forstall was a threat to Tim Cook. Forstall has been around since the Next days and was very close to Steve Jobs.

”

I wouldn't have signed that letter either. The whole maps thing was blown way out of proportion. Forstall lead the development of OS X and IOS and helped get Apple to where they are today and was close to Steve Jobs and has been around since the old NextStep days. Cook is another Ballmer and has no vision or clue about software.

”