Hi, i have a internal AD domain (Server 2012) with exchange server 2013 say abc.com. Only with 15 users
i am planning to move all emails to office 365.
i don't plan to purchase public SSL certificate, setup federation and exchange hybrid mode. i want to decommission internal exchange server
External network user currently able to connect to abc,com office 365 using outlook 2013 but the internal users still not able to do it.
i believe this has to do with the internal dns. i tried adding the autodiscovery.abc.com to my internal dns but still not working, I believe there are more to do..
Kindly advise what is the simplest way to resolve this issue without additional cost