Client access server role internet facing address question

When installing exchange there's a field that would ask if the Cas server role will be internet facing. So does that refer to OWA or something else? if it's something else what does it refer to?

OWA use to be on the perimeter for us but with 2010 that's no possible anymore. So for us OWA will be internal and we will use a ISA server/applicance to do the reverse proxy

In this situation do we need to internet facing address?  

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AkhaterSolutions ArchitectCommented:
internet facing option you are referring to is not only for OWA but for all the ExternalURL settings of exchange 2010 OWA, OAB, EWS, ActiveSync, Outlook Anywhere and others

OWA was never meant to be in the perimeter network neither in exchange 2000/2003 nor in 2007/2010. and yes if this CAS will server external clients this should be enabled

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Yes, you do.  If the server in question will service web based users then you need to install it like it will be.
iamuserAuthor Commented:
okay the cas server will be used for active sync and owa. Being that is the case, and from above, I will have give the case server an external address. But I'm still confused, my CAS server will be sitting internally in my network. I assume what ever address I use would have to be reachable by the internet or no?

 notice everyone uses Can I still use if I plan on using this for OWA? would it be,com or can i get away with

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AkhaterSolutions ArchitectCommented:
Yes the server will be in your network tnis is where it belongs.

And yes whatever address you use should be reachable from the internet

Any url will work, mail owa or any other
iamuserAuthor Commented:
so the url can be any name. it doesn't have to be the actual name of the CAS server. As long as it's reachable via the net

AkhaterSolutions ArchitectCommented:

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