Hi, I'm sort of confused as to what requires the use of a CAL or not. I have a sever that will used to host a unified messaging service for other users. There will be approximately 200 users and approximately 30 deivces that will connect. However at any one time a max of 20 devices could connect to this server for users connecting to this unified messaging service. It's a separate service from the unified messaging in exchange 2007. Thank you for any help.

Hi, For licensing issues, I suggest contacting your local Microsoft Customer Service for the most accurate information. http://www.microsoft.com/worldwide/ I hope your issue can be resolved soon. Tim Quan - MSFT