Interruptions caused by third party service providers, or changes made within customer managed environment, aren't considered service incidents. Service incidents may be caused by hardware or software failure in the Microsoft data center, a faulty network connection due to a change made by Microsoft, or a major data center challenge such as fire, flood, or regional catastrophe. Service incidents: A service incident is an event that affects the delivery of a service. For more information, see View the status of your services. Planned maintenance information is available on the Message Center.

View status of services: The Service health section shows the current status of the service and details about service disruptions and outages. Instead, see the 21Vianet service level agreement.

If you're using Office 365 operated by 21Vianet, some of the information below might not apply. Service health information is available at any time by signing in. Microsoft admins can view the status of services and find out when maintenance is scheduled.

Nine for office 365