This program is intended for server owners and will enable installation of different other virtual servers on the same computer.
Using a program like VMware Server will have multiple benefits, because will reduce your hardware costs. You can install different servers with different operating systems without any conflicts between them or between host and guests (virtual machines).
Allows to tweak settings for each virtual machine, you can allocate desired memory, hard disk space and processors. Allows to backup each guest and restore it at desired state.
You can use both Linux and Windows operating systems for your guests, there is not any conflict at all.