How does Microsoft inform subscribers of maintenance events that could temporarily disrupt
Microsoft Office 365 services?

A.
by emailing the Global Admin account for the subscription

B.
by updating the Message Center Dashboard

C.
by updating the Service Health Dashboard

D.
by updating the Online Service Level Agreement

Explanation:
When a service impacting event occurs, Microsoft Customer Service and Support recognizes that
timely and accurate communications are critical for customer organizations and partners. Microsoft
notifies Office 365 subscribers by updating the Service Health Dashboard that is available on the
Office 365 portal.

http://blogs.msmvps.com/bradley/2012/09/13/i-found-an-rss-feed-for-office-365-service-healthnotifications/