As with all purchases, you should check for special educational discounts. You can license Microsoft on a per seat or per server basis. Microsoft recommends Per Server. That gives the user more flexibility as you connect and re-connect machines. Obviously, software selection is critical in educational environments.
Educational institutions tend to run wider a variety of software titles than businesses.
Some games, for example, achieve dramatic effects by directly accessing the hardware. Purchasing enough memory is the most important consideration in setting up an NT server that makes users happy. Do not try to run NT Server with less than 128 Meg. Do not try to run Workstation with less than 32 Meg. It is strongly suggested that an NT server should have two CPU's.