Number of Exchange Servers

We have three physical office sites each connected to the internet with T1's and have VPN's running between each of the offices. We currently use Office 2003 Standard with an ISP pop3 solution. We need to implement an Exchange environment.

Site 1: 18 employees
Site 2: 5 employees
Site 3: 2 employees

Each site has its own DC with Site 1 having two. Each runs it own site in AD and DNS. The question I have is would it be better to implement ONE exchange server at Site 1 and just have the others connect over the VPN (btw, site 1 and site 2 will have a private T1 line installed shortly)? Or is it better to run an Exchange server at each site and get into multiple server sync issues?

I'd appreciate any additional background on the pros/cons of each.

Thanks!
jeremy95926Asked:
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itcozaConnect With a Mentor Commented:
Yip. with the connectivity you have and also in light of the advancements of Outlook 2003 you should have no problem if you implement a single server in the office with 18 users and have the other offices access this site remotely.

Also, you will also be able to support roaming users using Outlook 2003 and RPC over HTTP from your central site.  Then you can even provide them access to their mail from home without having to provide different configurations and documentation for the different sites.
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Lee W, MVPConnect With a Mentor Technology and Business Process AdvisorCommented:
Your costs to support 25 users would be EXTREMELY high if you went with one server per site.  In many ways, this completely unnecessary.  I would just use one exchange server for the organization.
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Michael SConnect With a Mentor Commented:
Install one Exchange server and set up site-to-site VPN's to where your users offsite can access Exchange as well as other resources.

Or install Exchange 2003 and set up RPC over HTTPs for the offsite users to access.

http://www.amset.info/exchange/rpc-http.asp
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SembeeConnect With a Mentor Commented:
Just to chime in with the others...

That number of users - just one server would be required. Anything else would be an overkill.
The only time I would consider multiple servers would be in circumstances where the users are moving large amounts of email between themselves in their own office - despite what the IT department might say about using a shared folder.

Simon.
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itcozaCommented:
Hi jeremy95926,

Do you need more information?

Regards,
M

;)
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