Macedonia's Marko Calasan got his first professional credential at age 6, when he passed the Microsoft Certified Systems Administrator exam. Now 9, he just went for the follow-on systems engineer certification.

Marko already has his first computer administrating gig, managing a network of PCs at a nonprofit that works with people with disabilities. Most of the work, Marko said, can be done remotely, though he has to go in person to handle hardware issues.

efitting his interests, Marko had the Windows 7 logo on his most recent birthday cake when he turned nine last July.

When he is not in school, or remotely managing IT for a nonprofit, Marko teaches computer skills to other children at a lab donated by Macedonia's Ministry of Education.

Here, Marko is speaking to a crowd at Microsoft's Slovenian offices, discussing Active Directory