MS Exchange 2010, front and backend server

PNRT
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Hi Experts.  I have a WAN with two sites connecting to a 2010 Exchange Server at Head Office by leased line.   Users on the remote sites are complaining about the amount of time it takes to download 3 and 4 MB emails.   I would like to put Exchange Servers at both remote sites so that mail can arrive at head office and then be forwarded to the exchange servers on the remote sites so that access is immediate for the users on those sites.     I would also have all the exchange servers as Domain Controllers.   This was fairly straightforward with 2003, please can someone advise if this is the correct scenario for 2010?   Many Thanks in advance.
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Commented:
You can install Exchange 2010 on a DC, it is not recommended however (performance & security issues)

So, yes, this scenario would work!

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Commented:
Thanks for the reply, so if we just installed the exchnage server at the remote site without making it a DC, mail could be forwarded automatically from Head Office directly to that server for quick access for the local users?  Thanks again.
Commented:
Yes, you would have an Edge server in one site that receives the mail from the internet and a hub transport server in the other site, this hub server receives and processes the mail from the edge server before sending it to the client.

See also this site: http://technet.microsoft.com/en-us/library/dd297988

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