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Do I need CAL's for Exchange Server?

We're in the process of purchasing an Exchange 2007 server. I've already purchased the software, and the 400 CAL's for Exchange.
While I was looking at OS software, I decided to go with Windows 2008 SP2, our current environment is 2003 R2.
So my question is, will I need a Windows CAL for all users connecting ti the exchange server either via Webmail or Outlook? Or would my 400 Exchange CALS work?

Thanks for any help you can offer on this

4 Solutions
James HIT DirectorCommented:
The answer is you will need Exchange CAL's and Server CAL's for every user that connects to the server.

Adam BrownSr Solutions ArchitectCommented:
You would need to purchase CALs for the Server OS as well as Exchange. Exchange CALs don't cover access to the OS. The number of CALs you need depends on how you handle the licensing, and it's best to talk to Microsoft to determine the appropriate number.
You will need CALs for Windows Server and for Exchange. If you are using other MS technologies then you may find CAL bundles more cost effective http://www.microsoft.com/calsuites/en/us/products/default.aspx
Neil RussellTechnical Development LeadCommented:
In short you need.....

A license for your server, one for your exchange install, one for your workstation OS, one for your email application (Outlook?) AND THEN you need a CAL for each client machine to connect to the server AND a CAL for each Mail client to connect to exchnage!
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