Flipping DR and HQ Exchange sites

We have a customer that wants to do a flip make their DR site (Site A) the active site for their already installed Exchange 2010 infrastructure.  Until their new DR site comes online, they will use HQ (Site B) for Exchange DR.

Currently, they have a DAG that stretches across both sites (so not problems there.)  My big concern is the CAS part.  They have a Windows NLB with 2 CAS/HUB servers in Site B.  I will deploy a Kemp NLB in Site A with 2 CAS/HUB servers behind it.  (One of those servers already exists and I will add the other.)

They use 2 namespaces for access -- webmail.domain.com (points to Site B) and webmail2.domain.com (points to Site A).

For the switchover, I plan to (right now, I'm not worried about the order):

1. change the external and internal DNS records and switch IPs to webmail=site A and webmail2=site B
 
2. do the same for MX records

3. Move all DBs to DAG members in Site A

4. Use set-clientaccessarray command in each site to switch the names.  Make sure the right one is applied to each DB

5. Use EMC to flip the internal/external URLs for OWA, ECP, ActiveSync, OAB

Anything I'm forgetting?

Thanks!
Brigh-GuyAsked:
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
No, move the DNS record for the RPC CAS Array.

Simon.
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Simon Butler (Sembee)ConsultantCommented:
Changing the CAS Array name isn't going to update the clients.
If you have a CAS array in place, then just move it to the other site. Don't change anything on the databases. Everything else looks ok.

Simon.
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Brigh-GuyAuthor Commented:
Sembee2...Are you saying to just move the actual servers?  That's not really an option here since they want to keep both sites alive.  Additionally, that would take too long to accomplish and would extend the outage window beyond what they're allowing me.  Thanks, tho, for the comments.
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Brigh-GuyAuthor Commented:
Cool.  That's my plan.  Thanks.
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Brigh-GuyAuthor Commented:
Thanks for responding.  The swtichover went very well.  This article was a good help.  http://support.microsoft.com/kb/940726?wa=wsignin1.0
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