troubleshooting Question

Transition from Exchange 2003 to Exchange 2010

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Bestway ITFlag for United Kingdom of Great Britain and Northern Ireland asked on
ExchangeEmail Servers
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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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