I have exchange 2013 2 server's all in one role with DAG configured. I have a issue in configuring IMAP in outlook. Tried in 2007/2010/2013 outlook clients. While creating the account everything is fine in outlook, but when opening outlook, it just hangs and some time getting error unable to expand folders.
below error seen in exchange server
Task 'Synchronizing subscribed folders for firstname.lastname@example.org.' reported error (0x8004DF00) : 'Outlook cannot synchronize subscribed folders for email@example.com. Error: The server responded: 'Server Unavailable. 15'. If you continue to receive this message, contact your server administrator or Internet service provider (ISP).'