START: May 12, 2011, 10am PST
END: May 12, 2011, 5pm PST
Service Bus will be impacted until May 16, 2011, 10am PST
AppFabric LABS Service Bus, Access Control and Caching services, and the portal, will be unavailable during this period.
Additional impacts are described below.
The source of the content taken from Microsoft blog.