By earning a MCAS Microsoft Certified Application Specialist credential, you can prove your expertise in using the latest Microsoft Office programs and the Windows Vista operating system. Certification can help you differentiate yourself in today's competitive job market, broaden your employment opportunities by displaying your advanced skills, and result in higher earning potential. Certification can also lead to increased job satisfaction. Research indicates that certified individuals have increased competence, productivity, and credibility with their employers, co-workers, and clients.