Try microsoft website for details about the objectives and differences between the two certifications. I'm sure you would have to know all the info for both 2000 & 2003 if you opt for the upgraded cert.
Of course, a Windows 2000 cert will expire sooner than the 2003. But, Windows 2000 will be more widely used in the workplace (over the newer 2003) as most companies are slow to upgrade software.






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