The University of St Andrews is a Certification Authorised Testing Centre and delivers invigilated, task-based exams, approved by Microsoft. Microsoft Office Specialist (MOS) certifications are a recognised industry standard qualification designed to benchmark and validate skills in Microsoft Office. What is Microsoft Office Specialist Certification (MOS)? World class: Read about our star performers, including one just this summer, who made it to the MOS World Championships, on our MOS Roll of Honour page.