We have a hybird Exchange setup with two Exchange 2013 CAS/Mailbox servers fronting our Exchange 2010 CAS servers with two Exchange 2010 Mailbox servers (DAG). I have a small pilot group in O365, no mailboxes on the Exchange 2013 servers remaining mailboxes are on the 2010 DAG. When I put one of the Exchange 2013 CAS/Mailbox servers into maintenance mode and reboot the server; what impact will the users experience in Outlook or OWA?
-- T. Todd Lemmiksoo
