Had Microsoft launched Office on the iPhone and iPad early on, they could have furthered the impression that Office was a must-have for anybody serious about anything, even on iOS. But they let years pass, and now Microsoft’s flagship applications aren’t so must-have anymore and Apple isn’t overly eager to accommodate them. It’s easy to imagine that four years ago when preparing to launch the iPhone App Store Apple may have been more willing to negotiate with Microsoft to get flagship apps like Word and Excel on the smartphone. But today? Apple’s doing just fine without them.