"Although nobody should be using the Outlook app anyway, because it's terrible."
Honestly from a usability point of view I don't think it is terrible, particularly for free, as long as you're not concerned about the whole cloud storage thing.
I was using the official Outlook app quite happily for my personal mail until I bought Nine to use for my work email, because once you've bought it, why not use it for all compatible email accounts.
Biting the hand that feeds IT
