We have a 2010 Exchange server which lost power for over an hr, I did a proper shutdown up when the power came back on, after boot up all 2010 email outlook client can not access mailbox.
I've got this error in the event viewer.
Exchange ActiveSync has encountered repeated failures when it tries to access data on Mailbox server [EXMAILSERVER1.campus.woodlandspreparatory.org]. It will temporarily stop making requests to the Mailbox server for  seconds to reduce load on that server. This delay may occur if the Mailbox server is overloaded.