Per Server Licensing Under the per server licensing approach, you must purchase a license for each user who connects to a specific server. If a maximum of 50 users bill log on to Server A, 50 client licenses must be allocated to that server. If 25 users will log on to Server B, 25 licenses must be allocated to B, for a total of 75 licenses. Per Seat Licensing If you choose per seat licensing, you must purchase a license for each computer on the network. If you purchase 100 licenses allocated on a per-seat basis, 100 users can access an unlimited number of servers. Per seat licensing tends to be the more economical approach if users routinely access multiple servers. With per seat licensing, licenses are installed "from the top down."