exchange 2007, 2010, ROLES

while deploying exchange 2007 or 2010

which role should be installed first. CAS, HUB, MAILBOX , OR EDGE
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Sean FitzpatrickSr Lab Systems EngineerCommented:
Henry DunnCommented:
That link points to a TechNet article for upgrading from 2007 to 2010, which is not what the poster asked.

Pramod, Exchange deployments can be very complicated endeavors.  Typically with both of the Exchange versions you're requesting help with, you'll deploy multiple roles together on a single server, perhaps even all roles.  It really depends on your requirements and design; what you're attempting to accomplish.  If you were deploying each role as a separate server, here's that that would look like for each.
For Exchange 2007:
Client Access First, then Edge Transport if you will be utilizing that role, next Hub Transport, then Mailbox and finally Unified Communications if you're using it.  CAS, HT and MB roles are required and must be present in every Exchange Org, at least one of each.  UC and ET are optional and will be deployed depending on your requirements.
For Exchange 2010:
Client Access first, then Hub Transport, then Mailbox, then Edge Transport and finally Unified Communications.  Same applies to these roles as with the Exchange 2010 roles with regards to required versus optional.  Hope that helps.

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AmitIT ArchitectCommented:
Is this a fresh installation or you already have older Exchange version in the environment. If fresh installation, it hardly matter, what sequence you need to follow, if you are planning to do transition, then follow CAS>HUB>MBX
Sean FitzpatrickSr Lab Systems EngineerCommented:
FYI, You posted the same link for the installation that I did in the original post.

Literally the exact same steps.
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