Best practice: Enabling autodiscovery

Make sure that 

Microsoft Exchange

 Autodiscover is set up correctly. For more information, see the 

Microsoft

 documentation for 

Microsoft Exchange

.

In a

Microsoft Exchange

 environment: Make sure that the autodiscover URL routes to one of the Exchange client access server (CAS) servers. If your environment uses a load balancer, make sure that the Auto Discover URL routes to the load balancer and then route it to your group of CAS servers.

In a mixed 

Microsoft Exchange

 environment (for example, 

Microsoft Exchange Server

 2013 and 2016) environment: Make sure that the autodiscover URL routes to the latest version of the CAS servers (for example, the 

Microsoft Exchange Server

 2016).

In a cloud-based 

Microsoft Exchange

 environment: the autodiscover URLs are typically managed by 

Microsoft

, however if your environment migrated your domain to a cloud-based 

Microsoft Exchange

, make sure that the domain autodiscover URL routes to 

Microsoft

's autodiscover URL (for example, https://autodiscover.outlook.com). On the DNS admin portal, make sure a CNAME record is created and that it redirects https://autodiscover.<

mydomain

>/autodiscover/autodiscover.xml to https://autodiscover.outlook.com. 

In a cloud-based 

Microsoft Exchange

 hybrid environment: mailboxes can exist in both on-premises 

Microsoft Exchange

 and cloud-based 

Microsoft Exchange

. Make sure that the autodiscover URL routes to the on-premises 

Microsoft Exchange Server

.