Microsoft Office Specialist (MOS) certification is a global standard for demonstrating computer skills required for working with Microsoft Office 2000, XP and 2003 applications. The MOS program is helping to train a qualified and skilled workforce for the modern workplace.

Microsoft Certified Application Specialist (MCAS) is an upgraded version of the MOS certification that validates skills required for working with the 2007 Microsoft Office system as well as the new Windows Vista operating system.