Exchange Server 2016 and el capitan 10.11.6 apple mail client

[mmcgreevey]

Hello,

Since migrating users to our new Exchange 2016 on prem server - some users are unable to connect to their exchange mailbox from el capitan 10.11.6 apple mail program. I also tried Thunder bird but it fails on username / password - attempted with admin account. Admin account sets up fine in outlook (windows). IMAP is enabled on the server and the user mailbox.

any suggestions?

[DSPatrick]

You'll have a much better chance of reaching many more experts by asking over here in dedicated forums.

https://social.technet.microsoft.com/Forums/office/en-us/home?forum=Exch2016GD%2CExch2016CM%2CExch2016MFSM%2CExch2016Adm&filter=alltypes&sort=lastpostdesc

[mmcgreevey]

https://social.technet.microsoft.com/Forums/office/en-US/fb50527c-0093-4986-a0db-5e486d7db657/exchange-server-2016-and-el-capitan-10116-apple-mail-client?forum=Exch2016CM