Settting up Outlook Anywhere (HTTPS over RPC) High Availability in Exchange 2007

My question is essentially: How can I enable Outlook users to use Outlook via HTTPS over RPC externally to failover and connect to a different Exchange 2007 Hub server on a separate datacenter for redundancy?

I've implemented a new Exchange 2007 environment with 2 x Hyper-V nodes each running a VM for clustered Mailbox CCR and another for Hub Transport & Client Access roles.  I want to move one of the boxes into our offsite Datacenter rack for redundancy.  The sites are link by a private fibre connection and will be fully routable internally.   I understand how to keep the CCR working between the two sites and that the Transport roles should work pretty much automatically.  I also understand that I can use Windows NLB to failover between the Hub servers internally.  What I'm not sure about is how I can make this work externally when the Hub servers will both have different static IPs?
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MesthaConnect With a Mentor Commented:
As that example shows, you will need to have three IP addresses, with the traffic pointing at the cluster.
Personally I would put everything in to the data centre.

To be picky - Outlook doesn't connect to Hub, it connects to CAS.

This blog posting explains how it can be done.

theITcrowdAuthor Commented:
Thanks for your quick response, be as picky as you like! ;-)  However what I'm trying to understand is how I can have my external Outlook Anywhere clients failover in the event of a internet failure (for example) at the primary location.  At the moment they connect to which is pointed Static IP at Site A.  If Site A's internet connection fails I'd like to somehow automatically redirect to the CAS server at Site B.

not sure... if that is possible...

what i think is u will have to manually configure the firewall to send requests to CAS in site B...

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