Adding additional Exchange 2010 server in new site - how to handle ActiveSync, OWA, etc

2x Exchange 2010 servers in different AD sites
1 on subnet A (colo), 1 on subnet B (office)

Exchange A is the original one and I have added Exchange B to the mix. Everything seems to be okay. I have moved a few old mailboxes, set up the SSL certificate, DNS, etc.

Without adding another server, how do I keep this migration seamless if I do it in stages? It's going to take a long time to move mailboxes from one Exchange to the other, but I want ActiveSync, Outlook Anywhere, OWA, etc to keep working and not have to upset a bunch of users.

I see this but wondering it is just as easy as
Set-OWAVirtualDirectory -Identity "Contoso\owa (Default Web site)" -CrossSiteRedirectType Silent ?

Do I need to do anything else for Outlook Anywhere or ActiveSync?

Once someone has been redirected to the new server, do they need to update the config on their mobile device(s)?
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mvalpredaAsked:
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Simon Butler (Sembee)ConsultantCommented:
Outlook Anywhere and ActiveSync will proxy to the other server, although if you publish a new URL for Outlook Anywhere in the second location, Autodiscover should pick that up and correct the clients.

OWA will redirect, as long as you have forms based authentication enabled and the same format for authentication set on both sites.

If a NEW connection is made in ActiveSync, and they use Autodiscover, then it should be pointed to the correct server, rather than going through the proxy.

You can test this for yourself with a test account and the Microsoft test site at http://exrca.com/ 
Don't do an Autodiscover test, but choose to put in the manual information. Enter the "wrong" site URL and you should find it still connects.

Simon.
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mvalpredaAuthor Commented:
I have all the URLs published and an SSL cert installed. I will try a test user and see what happens.

If all is correct, Exchange will update the client and the user should not even notice?
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Simon Butler (Sembee)ConsultantCommented:
As long as they are in different AD sites, then Exchange will update the Outlook clients automatically. ActiveSync is a different matter.

Simon.
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mvalpredaAuthor Commented:
I wasn't as worried about Outlook as I was about ActiveSync. I hate reconfiguring phones/tablets/etc
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Simon Butler (Sembee)ConsultantCommented:
ActiveSync is very hit and miss because it is down to the individual implementation of ActiveSync by the vendor - completely out of Microsoft's hands. Some of them will regularly query Autodiscover and will therefore get the new configuration. Some do it just once. Others cannot do it properly at all.

If you have your end users on the same device, then I would test it. Otherwise you are going to have to expect some failures.

Simon.
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mvalpredaAuthor Commented:
Do I need another _autodiscover._tcp. record for external DNS?
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Simon Butler (Sembee)ConsultantCommented:
No.
Autodiscover can be handled by any server in the org. You do not need to have Autodiscover going to the second location as well.

Simon.
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mvalpredaAuthor Commented:
Then even if the mailbox is on a different server the autodiscover will get that figured out for them?
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Simon Butler (Sembee)ConsultantCommented:
Autodiscover is a domain wide thing - it doesn't matter what server the client hits, it will get the correct information.

Remember Exchange is a domain product - the servers are just containers for the data. The configuration is stored in the domain.
Furthermore the CAS role does not "belong" to any specific mailbox server. CAS can be used by any mailbox in any location.

Simon.
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mvalpredaAuthor Commented:
Still doing some testing. Have not moved any mobile devices yet....
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