We are using manage engine service desk plus version 9.2,Recently we migrated from exchange server 2010 to 2013,we want to move thew service desk mailbox to exchange 2013 ,i am able to telnet from service desk server to exchange server on port 143 and i am able to even send email through telnet from service desk server.

but the service desk mailbox is not fetching emails from the exchange 2013 mailbox,what could be the cause?

Regards