I just purchased new computer with windows 10 and office 365.  I already have another computer running outlook 365 and that one installed and works fine.   I enter my exchange server settings exactly the same way as the other computer, and OUTLOOK doesnt start.  i get the message THE CONNECTION TO MICROSOFT EXCHANGE IS UNAVAILABLE.  OUTLOOK MUST BE ONLINE or CONNECTED TO COMPLETE THIS ACTION.  Then a microsoft screen appears where i can enter my Micrsosoft exchange server and Mailbox info.   no matter what i push next (either the CHECK NAME or the OK button), immediately the message appears :  THE NAME CANNOT BE RESOLVED.  HE CONNECTION TO MICROSOFT EXCHANGE IS UNAVAILABLE.  OUTLOOK MUST BE ONLINE or CONNECTED TO COMPLETE THIS ACTION.   That message pops up immediately, as if it never actually checks.    Then i have to click OK, and immediately the message appears  CANNOT START MICROSOFT OUTLOOK.  CANNOT OPEN THE OUTLOOK WINDOW.  THE SET OF FOLDERS CANNOT BE OPENED.  THE FILE  C:\USERS\Roman\APPDATA\LOCAL\MICROSOFT\OUTLOOK.OST is not an OUTLOOK DATA FILE (.ost).        

I am connected to the internet and i entered the same settings as my other devices that work just fine.  HELP!

if i go to my web OWA version, it works just fine too.  and on my SAMSUNG phone it works fine too with the same info.

Hi,

According to your description, you can connect exchange server on owa and mobile device.

So I think the issue is related to your outlook side.

I suggest we can try to recreate a new outlook profile to test.

Regards,

David