In a Microsoft Exchange Server 2007 organization, a computer that is running Exchange 2007 that has the Client Access Server role installed can act as a proxy for other Client Access Servers wit...
Updated Jul 01, 2019
Version 2.0
Blog Post
Hi John,
By default we have Basic authentication configured for /Exchange and /Public vitual directorioes. If your mailbox is located on an Exchange 2003 server you need to enable Integrated Windows Authentication via Exchange System Manager.
Proxying is not supported between virtual directories that use Basic authentication. For client communications to be proxied between virtual directories on different servers, the virtual directories must use Integrated Windows authentication.
When you install Exchange 2007, four virtual directories are created for Outlook Web Access: owa, Exchange, Public, and ExchWeb. The owa virtual directory provides access to Exchange 2007 mailboxes. The Exchange and Public virtual directories provide Exchange
2003 mailbox access. If a user who has a mailbox on an Exchange 2003 server logs on by using
https://server name/owa, they will receive an error telling them that their mailbox is on an Exchange 2003 server. They must use the Exchange virtual directory. If they log on by using
https://server name/Exchange, the Exchange 2007 Client Access server will proxy their request to the Exchange 2003 mailbox server. If a user who has a mailbox on Exchange 2007 accesses
Outlook Web Access by using https://server name/owa
https://server name/owa, they will be able to access their mailbox directly. If they log on to Outlook Web Access by using
https://server name/Exchange, they will be redirected to
https://server name/owa.
Here you will find more information about Proxying and Redirection.
http://technet.microsoft.com/en-us/library/bb310763.aspx
Vandy Rodrigues