Steve Jobs Bill Gates
Steve Jobs, left, and Bill Gates, right, were alternately allies and enemies throughout their tenures at Apple and Microsoft, respectively.
  • Microsoft's Bill Gates and Apple's Steve Jobs never quite saw eye-to-eye.
  • They went from cautious allies to bitter rivals to something almost approaching friends — sometimes, they were all three at the same time.
  • It seems unlikely that Apple would be where it is today without Microsoft, or Microsoft without Apple.

Steve Jobs and Bill Gates were alternately allies and enemies throughout their tenures at the helm of Apple and Microsoft.