So we recently upgraded our on premises server exchange 2013 to the latest roll-up, I also think its important to note that, we use office 365 for various things (but not email obviously)
Mobile Phone Mail, Web Mail client (OWA) ALL WORK!? using the on premises exchange 2013 server so I know it works, Also The windows 10 built in mail client works!?
This is a serious mystery to me I have been working on it for days, the boss is NOT happy, and every day that goes by I fear for my life (joke)
But seriously there must be a reason this is happening. Why does it work for everything EXCEPT MICROSOFT OUTLOOK?!
Why does it prompt us twice for passwords and it goes like this: First time , it prompts us, we put in email and password, and it goes through no problem Second prompt , (kind of looks like a Microsoft Account prompt to me) that does not go through and prevents us from accessing our email.
PLEASE HELP ME ASAP I WILL BE FOREVER GRATEFUL!
pulling hair out - thank you tom