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Exchange 2010 CAS Insatllation

I will be installing 2-2010 CAS Servers in and existing 2003 Exchange Organization.  The CAS servers will be configured into a CASArray.  Should I check the  "Internet Facing" option on both servers during setup?

Or should I wait until the CASArray is configured then configure the CASArray fot "Internet Facing"?  
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JimmyRiverside
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JimmyRiverside
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viveksahuCommented:
Hi,

You can install Exchange 2010 in your existing Exchange 2003 environment without affecting the end users.

There is No issue in Checking/unchecking the “The Client Access Server role will be internet-facing” check box during the installation of CAS Role.
 
It wont make any impact to your end users who are accessing OWA through Exchange 2003.
 
Actually you need to change your internal and external DNS records to point towards exchange 2010 CAS server for accessing the OWA and other services through Exchange 2010 CAS Server. Until then End users wont be able to access the Exchange 2010(right now your DNS records configured to point towards your exchange 2003 CAS Server).
 
Until you do these DNS changes End users will be able to access the OWA through Exchange 2003 without any issues.
 
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viveksahuCommented:
Hi,

If you did not configure the external domain during the installation of the CAS roles, you can of course do so using the Exchange Management Shell (EMS) or via the property page of each vdir like it was possible in Exchange 2007. But Exchange 2010 also makes you do this via a new “Configure External Client Access Domain” wizard. This new wizard can be accessed simply by right-clicking on Client Access under the Server Configuration workspace in the Exchange Management Console (EMC)

http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/load-balancing-exchange-2010-client-access-servers-using-hardware-load-balancer-solution-part2.html
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
You can do it either during installing the CAS role or later from the console. Not a big deal. You can install the CAS array after you have both CAS servers installed.

There is no real order, as long as all components are configured at some point.
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