Resolved: Resolved: University Collaboration Suite (UCS) partial service outage – July 22
From 11:57pm on Wednesday, July 22, through 12:40am on Thursday, July 23, University Collaboration Suite (UCS) experienced a partial outage. There was an issue with the underlaying hypervisor system for 2 of the hosts.
No email messages were lost and any queued messages were processed after the impacted servers were brought back online.
Story added 23. July 2015, content source with full text you can find at link above.