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A SAL can be used to access any number of instances of the Microsoft software. For example if you have a Windows Server and want remote access for ten users you must purchase 10 SAL?s. If you then purchase a second VM with a second copy of Windows and require access for the same ten users you do not have to purchase additional SAL?s. The existing SAL?s are valid for as many Windows Servers as you may wish to provision, thus additional Servers can be had for essentially the incremental cost of a VM without incurring additional server license fees.