MOS Certification Exams MOS is the most important certification for Microsoft professionals for career excel in their Microsoft field. However, if you are already working in relevant Microsoft field and got some experience and knowledge about its MOS certification then you must be very lucky to have some plus points. However, the cert4prep team consists of MOS certified professionals who are already working in the same industry. We hire them from different job websites to prepare the MOS training material to make you possible to pass MOS certification exams with the first attempt. Since they are already MOS certified they know which questions will you see in real exams that is why they prepare MOS exam like real test environment. Our PDF file which will have MOS questions and answers is available instantly after you make a purchase order.