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Transition from Exchange 2003 to Exchange 2010

Hello,

Our current Exchange environment has only one Exchange 2003 server and we would like to transition to Exchange 2010.

The Exchange 2010 implementation will have three servers with the roles as below.

EXCHSRV1 – CAS, HUB, MBX
EXCHSRV2 – CAS, HUB, MBX
EXCHSRV3 – MBX

I have tested the transition process successfully in a test environment but wanted to know whether there would be any client connection or mail flow issues with the current Exchange 2003 environment if I were to introduce the first Exchange 2010 CAS/HUB server with no further configuration for the time being.

An extract from training material provided to me by Learning Tree International suggests the following within quotes.

“In order for the CAS server to handle Exchange 2003 mailbox connections, the CAS server must not hold the Mailbox server (MB) role.

-Servers that hold CAS and MB roles can only access Exchange 2010 mailboxes”

Could someone also kindly verify this statement?

Thank you.
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Simon Butler (Sembee)
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Hello Simon,

Thank you for your quick reply.

Two of the servers will eventually be having all three roles. The one server with only the MBX role will be used for journaling.

Due to the Learning Tree International statement, I was going to install EXCHSRV1 with just CAS/HUB and EXCHSRV2 with MBX until all Exchange 2003 mailboxes were moved over to EXCHSRV2.

EXCHSRV3 would be worked on last.

Are you suggesting that there would be no issues with current client connectivity and mail flow following installation of EXCHSRV1 and EXCHSRV2 with all three roles during the Exchange 2010 installation wizard?

The only expected issue with Outlook 2007 and higher clients will be end users receiving certificate prompts until the RPC CAS ARRAY is configured and required SAN certificates registered.

Other than that, mail flow and mailbox connectivity should not be effected.

I would like to have the Exchange 2010 servers with their respective roles in place and achieve successful backups before moving incoming/outgoing emails and mailboxes to them.

Does this sound correct?
I completely missed it was only 50 points. I don't usually touch 50 point questions.
Sorry
Wow, I have never heard that before.

What kind of points are you looking to work with?
Remember you are trying to perform a transition.

Install only one 2010, move 1 mailbox and test everything, owa, autodiscover, mobile devices, etc.; Then remove your 2003 and then install the other server for your other needs.

It is not recommended to transition to a complicated or more elaborated environment.

As to my knowledge... keep it simple and it will be easy to manage in case of problems.
Hello,

Yes, I plan to take things one step at a time which is why the main query was whether it would be okay to perform an Exchange 2010 installation (on one server) with just the CAS/HUB roles and no further configuration without having an impact on the existing Exchange 2003 environment.

By impact I am referring to mail flow and client connectivity issues (MAPI, AS and OWA).

My understanding thus far is that I should go ahead and install all three roles (CAS/HUB/MBX) on the first Exchange 2010 server and the only issue that may arise is Outlook 2007 and above clients receiving certificate warnings every time they open the application.

Following installation of the first Exchange 2010 server and taking care of Internal DNS entries and RPC CAS Array, I intend to generate a Certificate Request for a SAN certificate and submit it to one of the online Certificate Authorities.

I will only work on directing (incoming/outgoing) mail flow through the RPC CAS Array (which for the time being will point to one of the CAS servers until we install hardware load balancers) once I know that the certificates are in place.

All remaining tasks will be completed once the above is in place and fully functional.

Could you please confirm this to be correct.

Thank you.
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