Microsoft outlook app using exchange online domain - Microsoft outlook 365

Copper Contributor

The set of folders cannot opened.  attempting to connect to Microsoft exchange has failed. 


The email can be set up on iphone and mac with out an issue. The only problem is with the seteup on the windows computer - Windows 10

1 Reply

To eliminate these issues for users with cloud mailboxes, perform the following steps:

Create a CNAME record in DNS that points to

Be sure to create this CNAME record in your internal and external (public) DNS, because users might connect from internal or external Internet connections.

In our example, the domain is used in the request. This means you don't need to specify the domain in the URL.

Configure the Outlook on the web redirect in the on-premises organization relationship: To do this, use the following syntax in the Exchange Management Shell in on-premises Exchange:


Set-OrganizationRelationship -Identity <Organization relationship identity> -TargetOWAUrl http://<CNAME value>/owa


I hope this helps!