"Just deserts" is idiomatic and means getting what is deserved or just (good or bad).
Apple will get even - by launching a successful wearable.
Not really. There customer satisfaction is slightly higher than Android but still significantly behind iOS.
The mail, contacts, and calendar apps should not insist that you login with a Microsoft ID in order to work. There may be plenty of good reasons to us a Microsoft ID but choosing not to shouldn't...
"Can't this be considered as an anticompetitive action?"
I don't see how, Google supports open standards for accessing their services.