Exchange 2013 Autodiscover and Outlook Provider

Exchange 2013 Autodiscover and Outlook Provider

In earlier version of exchange like 2007/2010 there are three Outlook provider used for autodiscover and Outlook Anywhere

Where Internal Outlook Client uses EXCH and External Outlook Clients uses EXPR and third provider known as WEB

• The EXCH setting refers Exchange RPC protocol that is used internally which provides the internal URLs for the Exchange services 
• The EXPR setting refers Exchange HTTP protocol that is used by Outlook Anywhere which provides the external URLs for the Exchange services
• The WEB contains the URL for Outlook Web Access for the user which is not in use.

Whereas in Exchange 2013 there is no longer directly uses EXPR/EXCH Outlook Provider.

• Exchange 2013 uses two different EXHTTP providers for internal and externa respectively for Exchange 2013 user mailbox which are dynamically generated.
• It will process and use them on getting the Internal EXHTTP settings first and External EXHTTP settings second.
• In order to support EXHTTP Outlook provider the minimum supported client versions are as follows

1. Outlook 2007 SP3, 12.0.6665.5000
2. Outlook 2010 SP1, 14.0.6126.5000
3. Outlook 2013 RTM

Note: To check Outlook Version look at Outlook.exe file in the Windows Explorer