Service Disruption: User Mailboxes

***UPDATE***
All affected users have now had their mailboxes restored. However, if you are still experiencing issues accessing your mailbox, please contact the Service Desk quoting the reference number detailed below. 
UoD IT made a change this morning  that has resulted in some users losing access to their mailboxes. We have identified a resolution and are currently deploying this to affected users. If you are one of those affected users,  please contact the Service Desk quoting reference number 1910-0968.
Please accept our apologies for the  inconvenience caused by this change.