Do I really need a exchange 2003 FrontEnd server to coexist with exchange 2010 in a standalone exchange 2003 setup

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vcuqit

Do I really need a exchange 2003 FrontEnd server to coexist with exchange 2010 in a standalone exchange 2003 setup?
 
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Sean van Osnabrugge

The answer to this is yes and no. Officially, you do need one as stated here: http://technet.microsoft.com/en-us/library/aa998186.aspx under the Client Access Server coexistence section. In practice, it really depends on your requirements. The reason for a front-end Exchange 2003 server in this coexistence scenario is to provide your end-users with a single website for OWA and ActiveSync which will point to your newly deployed Exchange 2010 CAS server(s). The CAS servers will then redirect the requests to the Exchange 2003 Front-End server if the mailbox still resides on an Exchange 2003 mailbox server.

If either of the following scenarios are true, then you do not need to worry about the requirement for an Exchange 2003 Front-End server:

1) You currently do not provide OWA and ActiveSync to your end-users.
2) You intend to perform the migration in one-shot. All your users will be on Exchange 2003 and then Exchange 2010.
Sean | http://seanv.wordpress.com
 
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vcuqit

Thanks for clarifying this issue.
Now it's just choosing to coexist or migrate in one shot.
 
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Sean van Osnabrugge



If you are small enough to move everything in one shot, then just test your new server using a few mailboxes with any integration points (Outlook, BlackBerry, etc) and leave your old server online after the migration. This way you can always roll-back if there are problems, if not decomission away!

Best of luck to you.

Sean | http://seanv.wordpress.com
 
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