Microsoft uses AKS for their production workloads, but only for “minor” projects like “Office 365” which only has a “few” (200 million) users.
https://customers.microsoft.com/en-us/story/1536483517282553...
https://customers.microsoft.com/en-us/story/1536483517282553...
Like there's a litany of literature of how AKS completely dropped the ball, you don't have to take anyone's word on it from this thread. The difference between AKS and other offerings is _striking_.