Due to a number of changes in its core application, Outlook 2016 no longer supports Full Exchange connections to the Exchange 2007 server. If your account is currently on our Exchange 2007 server and you would like to use Outlook 2016, please contact our support team to see about migrating your account to the current Exchange 2013 platform.
Exchange 2007 POP3 and IMAP connections can still be used in Outlook 2016.