Question: HC panel removes the Exchange mailbox from the list when user disables it.
It is the default behavior of Exchange 2010 server to list a mailbox in Exchange Server’s section ‘disconnected Mailboxes‘ when it’s disabled. That's why it disappears, but after 10-20 minutes appears back in HC panel.
Trouble logging in? Simply enter your email address OR username in order to reset your password.
For faster and more reliable delivery, add firstname.lastname@example.org to your trusted senders list in your email software.