Our monitoring has alerted us to connectivity problems with some of our network which we are investigating as a matter of priority now. Mailbox servers are inaccessible. We will post an update shortly.

Update - most servers are back online - we are investigating issues with a SAN node which appears to have gone offline without explination.

Update #2 23:08 BST - we are continuing to experience problems with our SAN - engineers from Lefthand are trying to resolve the problem. Services may be inaccessible intermittently. We apologise for any inconvenience this is causing and assure you that we are working to resolve this problem as a priority.