Agreed, seems like way too many fronts to fight on. Back in the day when they were the evil empire (TM), this probably made sense - they were able to steamroll into new markets, right over the competition. Now that they're playing catch up in many of those areas, probably not so much.
Also, there's more: They're quite a bit into hardware, making input devices and, lately, Surface. They're also a big name in the enterprise software world, offering their own CRM and, I'm sure, tons of other things. They really do everything.
When you are in so many markets, your efforts will sometimes be ahead and sometimes behind the competition. It's the sort of normal Poisson distribution you'd expect to find anyhow.
Also, there's more: They're quite a bit into hardware, making input devices and, lately, Surface. They're also a big name in the enterprise software world, offering their own CRM and, I'm sure, tons of other things. They really do everything.