server virtualization

im new to virtualization what software do you recommend i use citrix or VM ware?
infact i hav installed server 2003 on my laptop and i want to install virtual clients what do i do?
Sun's Virtual Box, is free and does the same thing as those you listed.
Once installed, you can add as many different OSes as you want.
My only question is:
WHY would you install Windows Server 2003 on a laptop??? It would make more sense to run it as a "Guest OS" on Virtual Box!!!
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VMware ESXi Server Virtualization Walkthrough