I have a exchange 2013, and i was trying to connect the exchange mailbox in outlook 2013 by using POP3, the login box keep poping up, and i did a test from below testing link with POP3, it was success without any problem, and enabled pop3 and IMAP from below services, any idea ?
1. On the Exchange Client Access server, open Windows Task Manager. On the Services tab, the status for MSExchangePOP3 will show as Running if POP3 is enabled.
2. On the Exchange Mailbox server, open Windows Task Manager. On the Services tab, the status for MSExchangePOP3BE will show as Running if POP3 is enabled.