UCS Servers Update
On December 16, during the maintenance window (5-7 a.m.), an OS update will be made to some UCS servers. Users will experience intermittent service outages as the work is being completed.
No e-mail or information is expected to be lost as a result of the update.
More information: UCS Servers Update
Story added 10. December 2014, content source with full text you can find at link above.