Even though they might have 150 users, they are still legal. However, there are only 10 devices from which users can connect to the server. The actual number of users on a given shift varies as does the number of users from one shift to another.
Each shift has about 50 users who share 10 computers. Now, let's consider another example with a manufacturing company that runs three shifts. The more likely situation is that you will need to add CALs for the additional users. The latter option makes sense only if those 25 users will no longer be accessing the target server application. If you suddenly added another 25 users, you would have to either purchase and register an additional 25 user CALs in the Licensing console or revoke CALs from 25 existing users. When the number of user connections reaches 100, no more connections are accepted. As connections are made to the target application, the License Logging service keeps track of each connection. You purchase 100 user CALs and record those in the Licensing console (more on that a bit later). You install your server in Per-Server licensing mode. For the first example, assume you have 100 users, each of whom has a single desktop computer. Let's take a look at how Windows Server tracks license usage to help you better understand the differences and similarities between CAL types and licensing modes. For example, if you have 50 computers on your network but 100 users who share those computers, purchasing device CALs would cost half as much as purchasing user CALs. Device CALs are the same as Per-Seat CALs in Windows 2000 Server and are the logical choice when you have more users than devices. A device CAL allows a given device to access a particular server application.
Per-User licensing makes the most sense for companies that have more devices than users. For example, a single user CAL for Exchange Server allows a user to connect from his desktop, notebook, or home computer using Outlook from a public kiosk using OWA from a PDA or from a smart phone. A user CAL grants the right for a user to connect to the specified resource from any number of devices. Per-User licensing shifts the focus to the client, allowing any number of clients to connect to any server running the target application.
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