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Upgrade Exchange 2003 front end to Exchange 2007

Posted on 2009-06-29
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I have an Exchange 2003 cluster back end, with an Exchange 2003 Enterprise front end.  Is it possible to upgrade the Front End server to Exchange 2007 without touching the back end?  Also, is it absolutely necessary to purchase Exchange 2007 Enterprise, or will Standard work fine?
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Question by:esphelpdesk
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Joekim24x7 earned 125 total points
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Purchase the standard version for the frontend server.
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by:Joekim24x7
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Technically you can have the frontend server on E2K7 server.  However, you might read up on it.  Certificates and configuration is going to be the hardest part.
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by:FearNoMore
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In Exchange 2007 there is no concept of a FE server. There is only the CAS server.
It is possible to upgrade the E2K3 FE to E2K7 CAS
http://www.msexchange.org/articles_tutorials/exchange-server-2007/migration-deployment/replacing-exchange-2003-frontend-owa-server-exchange-server-2007-client-access-server.html
However I would recommend to Read section Client Access Server Coexistence in the below link
http://www.msexchange.org/articles_tutorials/exchange-server-2007/migration-deployment/replacing-exchange-2003-frontend-owa-server-exchange-server-2007-client-access-server.html
E2K7 Std will work fine
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by:Subsun
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by:Mestha
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Replacing the frontend with a new Exchange 2007 server is the preferred method to do a migration. You would need to have the server hold the CAS role at least - and if the server was also receiving email then it will also need to have the hub transport server.

By using an Exchange 2007 server you will have a full co-existence period which can be almost unnoticeable to users if done with care.
The backend servers should not need to touched at all.

Your tags say "DMZ". Do be aware that no Exchange 2007 role except EDGE is supported in a DMZ.

Simon.
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