Centralizing Exchange 2010 Infrastructure

Right now we have multiple sites with their own CAS/HUB/MB servers and a Microsoft TMG server in the DMZ for OWA, Active Sync & Outlook Anywhere.   One site has a CAS array with 2 mailbox servers, another site just has a single CAS server and a mailbox server and the other 4 sites have a single CAS/HUB/MB server.  We are a single domain.

We want to centralize at our main datacenter and put in 2 CAS Servers creating a new CAS Array and using Netscaler for load balancing and HTTPS traffic.    We are then going to build 4 new Mailbox servers and implement DAG.  Once that is completed we will start moving our users mailboxes to the new mailbox servers.    Our goal is to centralize and increase mailbox limits, enable retention periods and eliminate PST files on our file servers.

My question is can build all of this in our existing Exchange organization without breaking anything and as we get mailboxes moved over decommission the old Exchange servers.   I should mention we have a total of 2000 mailboxes and about 1000 of them are actual users.

Any input and guidenace would be appreciated.
AMSsupportAsked:
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Will SzymkowskiSenior Solution ArchitectCommented:
My question is can build all of this in our existing Exchange organization without breaking anything and as we get mailboxes moved over decommission the old Exchange servers.   I should mention we have a total of 2000 mailboxes and about 1000 of them are actual users.

The answer to your question is yes. You can completely build this scenario in your data center. The only thing you need to be cognizant about is the CAS array. If you do not want users connecting to your CAS servers then do not add these servers to your current CAS Array.

As long as you have your clients pointing to the current CAS or CAS array and you are not adding to it you can do this completely seamless.

Without any interruptions.

Will.
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AMSsupportAuthor Commented:
Thanks Will, so I can build the new CAS servers for now but just not create the array until I am ready to switch the users over to using the CAS array?   Because right now there is no CAS array in this site.    Sorry I just want to be clear.  Or should I just build the MB servers and leave the new CAS servers until later?

Thanks again for your quick response.
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Will SzymkowskiSenior Solution ArchitectCommented:
You are using Exchange 2010 based on the convo of (CAS Array). However in Exchange 2010 the preferred installation method is CAS/HUB/ then MBX. In order for you to move mailboxes etc to the new environment you are going to need to have CAS/HUB and MBX roles installed.

When you create your new CAS Array for your new Site as long as you do not have any of your clients pointing to the new CAS Array then you will be fine.

CAS Array is only good for a specific AD Site because that is it's boundary.

So go ahead and start the process just do not point your clients to this CAS Array until their mailboxes have been moved. Once that is completed you can decommission the old Exchange servers when all mailboxes/public folders/etc have been removed.

Will.
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AMSsupportAuthor Commented:
Thanks again for the clarification.  I appreciate it.
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AMSsupportAuthor Commented:
Will sorry I meant to hit yes that you answered my question and I hit no by mistake.....sorry about that.
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Will SzymkowskiSenior Solution ArchitectCommented:
You did? the question is still open.

Will.
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AMSsupportAuthor Commented:
Ok I will click Yes this time...thanks again.
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AMSsupportAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for AMSsupport's comment #a40725976

for the following reason:

Expert was very clear with his answer to my question and was very responsive.    He made feel confident to proceed with my project.
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Will SzymkowskiSenior Solution ArchitectCommented:
I think a mistake was made regarding selecting the correct answer. Could you please reopen the question to allow proper acceptance.

Will.
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Will SzymkowskiSenior Solution ArchitectCommented:
Can this question be Accepted and closed please.

Will
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Will SzymkowskiSenior Solution ArchitectCommented:
Can we please close this question.......

Please close the question or force accept from moderator.

Will.
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