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I'm planning to deploy Exchange 2010 in organization. This organization consists of 2 sites.

The plan for 1st location (holding most of the employees) is: - 2 x Windows Server 2008 R2 Enterprise - Forefront TMG Servers working in NLB - 1 x Windows Server 2008 R2 Standard with CAS ROLE (and EDGE?) behind TMG - 1 x Windows Server 2008 R2 Enterprise with MAILBOX AND HUB in DAG

The plan for 2nd location is (holding just couple of employees, eventually some external hosting): - 1 router (if necessary TMG server if not just simple hw box) - 1 x Windows Server 2008 R2 Standard with CAS ROLE (and EDGE?) behind TMG - 1 x Windows Server 2008 R2 Enterprise with MAILBOX AND HUB in DAG.

Those 2 locations will be connected thru IPSEC permanently.

  1. Considering that I will have TMG servers do i need to put EDGE servers outside? or I can keep them with CAS role.
  2. Will DAG work thru IPSEC tunnel efficiently ?
  3. Is this even good plan ? What would be the best plan considering we have 3-4 locations people need perm access thru IPSEC tunnel to access mail and we need HA solution. We're putting mail servers in 2 locations since we want to be sure one or the other works and accept emails, serves them in case of power failure or network failure in one of the locations.
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@MadBoy - Is your Active Directory configured with multiple sites, or just one? –  Ben Pilbrow Nov 29 '10 at 20:53
    
All our locations are connected thru IPSEC now and have access to AD. Plan is to make it better so most likely there will also be local AD server too. –  MadBoy Nov 30 '10 at 8:56
    
But do you have multiple sites configured in Active Directory Sites and Services? Depending if you have only one site or multiple sites depends on the way to implement HA. –  Ben Pilbrow Nov 30 '10 at 10:27
    
Only one, default site. But depending on need we can implement more if necessary. –  MadBoy Nov 30 '10 at 12:21
    
@MadBoy, How'd you manage to deploy the TMG 2010 as failover / HA cluster ? I'm interested in knowing that actually ? –  Server System Specialist Mar 4 '11 at 13:24

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