Outlook does not support connections to Exchange by using ActiveSync

Applies to: Outlook 2019Outlook 2016Outlook 2013

Symptoms


When you configure Microsoft Outlook to connect to Microsoft Exchange by using the Exchange ActiveSync (EAS) protocol, you receive the following error message:
Log onto Exchange ActiveSync mail server (EAS): The server cannot be found.

Cause


This problem occurs because Outlook does not support connections to a server that is running Exchange Server by using the EAS protocol.

Resolution


To resolve this problem, connect to Exchange by using the standard Exchange connection settings. For more information about how to configure Outlook to connect to Exchange, see Add an email account to Outlook.

More Information


The EAS protocol provides access to data in Exchange mailboxes to various devices and other clients. Outlook supports the use of EAS to connect to other services that support the EAS protocol. Because an EAS connection does not provide all the features of a standard connection to Exchange, Outlook does not support this method to connect to Exchange.