Is there a best practice for multi location server setups including mac mail server?

Afternoon all,
Last year I setup a client with Snow Leopard Server including hosting his mail on the server with Mac Mail Server and calendaring. He now has plans to open other sites with the same setup, how can this be done using Mac Server? The implementation of a new server on the new site would be straight forward my concerns / question are:
1. How would the two servers communicate?
    a.)Do they need to communicate?
3. How will mail across the two sites work?
    a.) How will DNS work for email internally?
    b.) How will DNS work for emai externally?
4. How will calendaring work across the two sites?
Is Mac Server the best platform for moving ahead with this type of business need?
Any help or direction would be greatly appreciated.
Anthony

Camelot,
many thanks for the speedy reply. Your comments are very helpful thank you, if I may I will give you some for information and some other questions.
The offices will be from 5 miles to 25 miles apart, the new office and ones that follow will be considered as branches of the main office for example the company name is Sunflower and it serves area 1, then new will office will serve area 2 and so on. So in theory I could leave the main server domain and mail mx record as sunflower and then add further servers as 2.sunflower.com, 3.sunflower.com as domains and mx records? This would then provide unique mail records and users within the organisation such as [email protected] and [email protected], which doesnt look to good I would prefer all users to be name@sunflower how can this be acheived?
With regard to user activity in the whole users will be fixed but their will be floaters such as managers and the owners that may at times float from one office to the other and would beneift from logging into any machine and getting their profile.
I have thought about VPN's as I have acheieved this type of setup with Microsoft server products, I have found speed issues in some cases, how can this be acheived using OS X, are there any how to docs around? In the Microsoft setup I acheived this using netgear VPN Firewalls which ofcourse adds an overhead, can this be acheived using OS X propietary VPN software?
So ultimatley I would prefer to have the one domain without subs "sunflower.com" and users to be able to login to their profiles from either location. The main location now will remain as headoffice and the primary location and the new will be satelites.
I hope that covers all of your other question, again many thanks for your comments and time.
Kind Regards
Anthony

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From what I'm reading, I should have a separate partition for each mac's TM to backup to.
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