"we leverage the message center to communicate new admin features to assure that you can get all service notifications and updates in one place."
Anne Michels Not trying to beat a dead horse but want to illustrate the sequence and why some of us are so upset. Especially in light of your "we notify you of new admin settings" comment.
The File integration was announced in the O365 Message Center on June 2, saying it was coming and turned on by default. But it didn't state what services were included. So, as noted by others, it was a "check message center daily for updates" for the remainder of the month.
There was no Message Center on June 22 or June 23 notice saying "this is live tomorrow" or "today" or already turned on. We had to hear about that here, or in following some Twitter accounts. There still hasn't been any notice in the Message Center!! So the Message Center did not notify us of an extremely imporant new feature and one with a lot of corporate ramifications.