Anybody else getting undeliverable internal emails in Exchange 365 starting in the past few minutes?

We are having a flurry of reported problems with users being unable to send emails to other internal users. They are getting an undeliverable notice sent back to them. Started around 11:05 AM ET.

EDIT: MS now reporting problems on the Service Health page. ~~The issue they report doesn't match exactly what we're seeing, but the timing is exactly the same.~~ Now there's more on there... posted at 11:32 AM ET

Timeline:

11:05 AM ET Users notified us of having emails to internal users being returned as undeliverable due to "DNS problems."

11:45 AM ET Just got an email from Code Two. Sounds like they don't know yet if it's them or Microsoft (or something else).

12:20 PM ET Code Two is now saying that they are not receiving new notifications. Hopeful that it may be resolved… no word on root cause yet

Last updated @ 12:28 PM ET: Microsoft's site now says "service restored" and the issue has been moved to the History tab. I guess it's over.