Is there any difference between Microsoft CAL Vs Microsoft Volume License. We are currently using Exchange Server 2003. I don't know what type of license we are using, since it is setup by previous IT guy. We have almost 80 mail boxes.
We would like to upgrade to either 2007 or 2010. But I can't figure out which type of license is suitable for us. We want to spend as low as we can! :)
Any further help would be greatly appreciated. Thanks!