Chester County OIC is a Certiport authorized testing center for Microsoft Office 2003 Specialist Certification exams. Microsoft Office Specialist (formerly also known as MOUS) exams use "live" or real applications to provide the most authentic evaluation of your knowledge, skills, and abilities. Certiportâs performance-based testing uses specialized examination software while simultaneously running the actual Office programs. Microsoft Office Specialist is the official Microsoft Office certification for desktop productivity. Certification is available in the programs listed below. Expert level certifications are offered for Word and Excel. Exams are available for Microsoft Office XP and Office 2003. Word Outlook(R) Excel PowerPoint(R)