An MCSE (Microsoft Certified Systems Engineer) is someone who has passed exams about the Microsoft Windows NT operating system, related desktop systems, networking, and Microsoft's BackOffice server products. The MCSE program is the most popular of a set of training programs that Microsoft calls the Microsoft Certified Professional (MCP). In other MCP programs, you can gain certification as a Microsoft Certified Solution Developer (MCSD), a Microsoft Certified Product Specialist (MCPS), or a Microsoft Certified Trainer (MCT).