“Microsoft originally set a late-October deadline in its message, but we’re guessing someone familiar with the impending demise of Exchange Web Services (EWS) had a quiet word.”
Microsoft announced a deadline, then quietly moved it a month earlier because the original date was after the thing it depended on shut off. Exchange Web Services dies October 1. Consumers on auto-update will never notice. Every admin running a managed iOS and Android fleet now has two months to push an update they found out about from a message that was wrong the first time.