The “Service health” page displays information in real time on the state of your service over the six previous days and gives an overview of the 30 previous days. You can also find out when planned maintenance is scheduled for your services.
To see the status of all your services and their components:
1. Login to your professional Office 365 account.
2. Access the Outlook 365 Administration Centre.
3. Access the State of Services.
4. On the Current State page, check the state for that day and the six previous days. You can also display an overview of the 30 previous days.
Select the RSS link to sign up for the service health RSS feed, which will send you an email when a new event is added or an existing event is updated.

IMPORTANT: If you can’t sign in to Office 365, you won’t be able to access the Service health page. Go to Troubleshoot sign-in to Office 365 to find out what to do next.