I recall in doing 2007 server migration from 2003 a dedicated CAS server was required to properly handle Activesync/OWA/Outlook anywhere. Does this still hold true with 2010? if a customer is coming from 2003->2010 I assume its still a YES But what if they are on 2007? does EAS proxy work? I assume OWA does since it has the URL redirect. This is for small environments with single servers..Thanks, Grady Vogt

Hello, If the users mailbox is on an Exchange 2007 Mailbox server, Exchange 2010 locates an Exchange 2007 Client Access server in the same Active Directory site as the user's Mailbox server. This may be the same Active Directory site as Exchange 2010. Exchange 2010 determines whether the Exchange 2007 Client Access server has the ExternalURL property configured on the Exchange ActiveSync virtual directory. If so, Exchange 2010 issues the client an HTTP error code 451 that contains the ExternalURL value and instructs the client to redirect to the location specified in the ExternalURL property. If no ExternalURL value is set, the connection will be proxied to the Client Access server using the FQDN specified by the InternalURL property, specifically to the /Proxy virtual directory, This virtual directory is located beneath the Exchange ActiveSync virtual directory in IIS and, by default, has Integrated Windows authentication enabled on it. Referred by: http://technet.microsoft.com/en-us/library/bb310763.aspx Thanks, Simon Wu Exchange Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

Hello, If the users mailbox is on an Exchange 2007 Mailbox server, Exchange 2010 locates an Exchange 2007 Client Access server in the same Active Directory site as the user's Mailbox server. This may be the same Active Directory site as Exchange 2010. Exchange 2010 determines whether the Exchange 2007 Client Access server has the ExternalURL property configured on the Exchange ActiveSync virtual directory. If so, Exchange 2010 issues the client an HTTP error code 451 that contains the ExternalURL value and instructs the client to redirect to the location specified in the ExternalURL property. If no ExternalURL value is set, the connection will be proxied to the Client Access server using the FQDN specified by the InternalURL property, specifically to the /Proxy virtual directory, This virtual directory is located beneath the Exchange ActiveSync virtual directory in IIS and, by default, has Integrated Windows authentication enabled on it. Referred by: http://technet.microsoft.com/en-us/library/bb310763.aspx Thanks, Simon Wu Exchange Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com

Things have been changed quite a bit speaking of Exchange 2010, here is good readup for you , which will get you started Understanding Proxying and Redirection http://technet.microsoft.com/en-us/library/bb310763.aspx E2007 Proxy or Redirect ? http://blogs.technet.com/b/mbaher/archive/2009/12/17/exchange-2010-proxy-or-redirect.aspx Also have a look if you have not done yet , Deployement Assistant http://technet.microsoft.com/en-us/exdeploy2010/default.aspx#Index ocd Oz Casey, Dedeal MCITP (EMA), MCITP (EA), MCITP (SA) Visit smtp25.blogspot.com Visit Telnet25.wordpress.com This posting is provided AS-IS with no warranties or guarantees and confers no rights.

Hello, Is there any update on this thread? Thanks, Simon Wu Exchange Forum Support Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com