The Exchange CAL is per user, not per deivce. So however many mailboxes you will have, that is how many CALs you need.
From MS site:
Q. If several users share the same desktop, do they each need an Exchange Enterprise CAL?
Customers may still license Exchange Server 2010 with either per-user or per-device CALs. If several users share a desktop and do not individually access the Exchange server from other locations (e.g. their home PCs) then they can be licensed with just one device CAL.
So then the question: Can I limit the OWA from the 95 other users at their home?
Looks like I was cut off there.. Here is the rest of it.
Right now I have an older web base mail client that Outlook can pop with 150 email accounts. I have two networks and 2 domains setup. About 25 of my users pop the server on the lan. The other 125 remote users access the email server via a webpage.
I will have 30 or so users that will want to access Exchange via mobile devices, laptops and desktops wherever they go. I was thinking the other 95 users can use OWA.
It’s my intension to purchase a new box with MS Server 2008r2 standard and Exchange 2010 Standard 1 server. From there purchase a mix of device and user cals.
Do I need an Exchange cal for every user? Do I just need cals for every computer/user on the lan that uses Outlook? Do I need to double up and get a server and exchange cal for every computer on the domain?