On Sunday 24th July 2011 starting at 5pm GMT we will be adding HSM storage to the zimbra-mbox1 server.  Any mailboxes on this server will be unavailable for the 10 minute duration of this maintenance window.  Emails arriving during this maintenance window will be queued and delivered once the mailboxes are available.

Maintenance Start: 17:00 (GMT) 24th July 2011

Maintenance End: 17:10 (GMT) 24th July 2011