Unable to log into Outlook Profile after upgrading to Outlook 2013 SP1

After upgrading to Outlook 2013 Service Pack 1, users are unable to login to their Outlook profile and receive an error from Outlook.

In Exchange Server 2013 SP1 and Outlook 2013 SP1, Microsoft changed the protocol that Outlook uses when connecting to an Exchange Server 2013 SP1 server. It now uses MAPI over HTTP, prior it was using the RPC over HTTP protocol.

The CAS would need to be configured to use MAPI and below are the commands that are required to correct the connection from Outlook to Exchange Server 2013.

First, confirm the status of MAPI in your Exchange environment. Using Exchange Management Shell, type the following command:

Get-OrganizationConfig | fl *mapi*

Second, confirm if the Mapi Virtual Directory has a URL configured.

Get-MapiVirtualDirectory | fl *url*

Third, type the following command to set the Mapi Virtual Directory URL and setting the authentication protocols.

Get-MapiVirtualDirectory | Set-MapiVirtualDirectory -InternalUrl https://<server_name>/mapi -ExternalUrl https://<server_name>/mapi -IISAuthenticationMethods Ntlm, OAuth, Negotiate

Perform an IISRESET in the exchange management shell.

When users open up their Outlook 2013 running SP1, it will now load the profile successfully.