I have a situation in wich there are 2 geographical site, in each site there is EX2k7 with the following roles:HUBDBCASAll work propery, but now i need to publish OWA outside. I have used ISA 2006 SP1.I have alredy registered a DNS record that point to apublic address,on wichISA is natted.When i access to the mailbox that are n the location same of ISA all works fine, but if i have the mailbox on the remote site, i'm not redirected.The question is, how is possible with isa to make a publishing rule that permit with a public name to go on the right CAS?i need to have different public name for every cas?What kind of solution can i adopt?

Hi,Do you have another Cas server inanother site then you need touse the concept callced Cas-Cas Proxy. Below document has some detailsdescription of Cas-Cas Proxyhttp://msexchangeteam.com/archive/2007/09/04/446918.aspxRegards,Krishnahttp://smtpport25.wordpress.com/

Make sure that ExternalURL has set to $Null for non-internet facing CAS server OWA virtual directory in remote site, so internet facing CAS will start proxying request to non-internet facing CAS for any OWA request. Refer below white paper to understand better with an example... Understanding Proxying and Redirection http://technet.microsoft.com/en-us/library/bb310763.aspx Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com