*Update*
The Notifylink service is back online.

A corrupted database entry stopped the flow of messages into the table where devices pick them up. The problem was corrected by the vendor and service has been restored as of 9:30 am.
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Previous Description (2010-05-10 08:01:19):

The Notifylink Service that provide Email and Calendar Services to mobile devices is unavailable.

IT Services staff are investigating.