Start Time: 12/31/2011 02:00 AM ET

End Time: 01/07/2012 06:00 AM ET

Summary:

Exchange Services will be interrupted twice during the maintenance window for approximately 10 minutes as services are failed over to redundant components.

Expected Impact:

Microsoft has identified a critical security flaw in .net 4.0. Due to the severity of this vulnerability we will be updating servers during the maintenance windows over the next week. Your services will be impacted twice for 10minutes as they are failed over to redundant components. We will send another notice once all updates are complete.

Action required:

none