It could have been the drop that made the bucket overflow (or however you say this in your language) and it is probably also an emotional thing of feeling poorly treated.
Honestly, I won't say the transition has been entirely painless - it does take time to adjust to a new operating system, but I have to say, my biggest regret is that I didn't ditch Apple's computers sooner. I love my iPhone but honestly it does feel like Apple just isn't all that interested in their desktop / laptop computers recently.
In college I learned that while Americans say "Kicked the bucket" or "Bought the farm" for 'died', Austrians say "Handed in their spoon". Which is farm more evocative IMHO.