*Update*

The maintenance related to this outage has been canceled. There should be no interruption.
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Previous Description (2012-08-13 14:07:58):

Server maintenance being performed on Wednesday August 15 and Thursday August 16 will cause a short interruption to non-Exchange (JES) mail service between 5:00am and 7:30am on both days.

If you loose IMAP or Webmail connection, please try again in 10 minutes.