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Exchange 2010 Design - Upgrade from 03

Posted on 2011-03-02
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We are looking at upgrading our Exchange Server 2003 environment to 2010.  My question is about the design.  We have the opportunity to build the 2010 environment from the ground up.  As I understand it the CAS is a huge portion of how the servers now interact.  We have approximately 6200 active users and we would like the optimal/minimal design for a single site environment.  We currently have 5 ADs that will be upgraded with the new schema (including legacy permissions) prior to the full upgrade.  

How many CAS servers would we need versus the other roles?

We're using a VM environment and we want to finish the environment, test move a few mailboxes to validate and eventually move all the mailboxes and just turn the old environment off completely.
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Question by:liquid101
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Tasmant earned 50 total points
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for MBX, you can find all you need here : http://msexchangeteam.com/files/12/attachments/entry453145.aspx
for CAS, yes in Exchange 2010 everything is done on (HTTP,POP,IMAP,MAPI ...)

http://technet.microsoft.com/en-us/library/dd351192.aspx
If you follow some ration, for 4MBX, you have 3CAS
If you plan to have CAS/HUB on same host, for each MBX you have a CAS/HUB.
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by:liquid101
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Is Edge necessary?  We plan on keeping the entire server setup well within the perimeter of our network.  What advantages beyond anti-spam and anti-virus?  We already have dedicated boxes for that.
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by:Tasmant
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you do not really need Edge if you have already boxes. only HUB/CAS/MBX are necessery.
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by:liquid101
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Thanks a bunch.  
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