Exchange 2010 ET role is is necessary

I am currently planning a Exchange 2007 to 2010 migration for a client that needs to have full redundancy in the design. Currently they run a single Exchange 2007 server with all the roles, and 2 spam filters. My question is do i realy need the Edge Transport role in the new 2010 environment? And were to place the HT role?

I am currently planning 2 Mailbox servers running DAG and HT, 2 CAS servers in a NLB cluster, using the 2 inbound spamfliters to act as the ET's.
itechbizAsked:
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Glen KnightCommented:
If it's in an NLB cluster then yes with the CAS role would be the best.

You wouldn't have it with the MBX role as you would use database availability groups.
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Glen KnightCommented:
Your question title says ET which is the Edge Transport role, this would be placed in the DMZ and sanatize your mail before it gets to youe Exchange organisation.

The Hub Transport Role is an internal role and is required.  Even if you don't have the ET role (which is not required)
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itechbizAuthor Commented:
Great thank you. So as for the HT placement, would it be best to locate that on the mail servers or the CAS in a NLB cluster?
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