Good Day;

Our company is using Kerio Connect to deliver e-mail and groupware 
functionality.  I have been asked to attach an `approximate´ number to the cost 
of switching to Exchange.  We have about 400 users spread across three sites.  
The main site hosts the mail server, and has about half of the user base.  The 
balance of the users are split over the other two sites.  The sites are 
interconnected via VPN. The main site has 100MB fiber.  One remote site has 
10mb fiber, and the third is using `business´ cable.  Each site has its own 
Active Directory infrastructure.

It´s been a long time since I played in the Exchange arena, so I don´t know 
what the current requirements are.   From what I´ve found on-line:

- An exchange system has several roles to be fulfilled, requiring at least two, 
maybe three servers; one for the mailboxes, one for relaying mail to the 
internet, etc.  These servers should not be doing anything else.  We're in a 
VMWare environment, so we can adapt accordingly.
- An Exchange server license for each server running some component of Exchange
- An Exchange user CAL for each user
- A windows CAL for each user (over and above the CALs I currently own)

Some questions that come immediately to mind:

I know that Exchange is intimately tied to AD.  What is the best way to have 
one Exchange system servicing the three sites?  
- Migrate all site to a single domain?  Obvious management benefits, but lots 
of labor and user disruption
- Create a new forest to include the three AD domains?  How well (if at all) 
will Exchange work with that?

Would it be a good idea to have a mailbox server in each site?  What are the 
pros and cons of that?

Any advice, or pointers to non-marketing technical info would be much 
appreciated.



Bud Durland
Director of Information Technology
1 Plant St. Plattsburgh, NY 12901
Office: 518.561.1812  Direct: 518.324.4850  Cell: 518.726.0967 


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