Microsoft 365 Fundamentals MS-900 Foundations

The Microsoft 365 Fundamentals MS-900 exam introduces cloud concepts, Microsoft 365 services, security, licensing, administration, and AI. Cloud computing delivers on-demand resources over the internet. SaaS provides software such as Microsoft 365, PaaS provides application platforms, and IaaS provides virtual infrastructure. Public clouds are shared, private clouds are dedicated, and hybrid clouds combine both. Scalability increases capacity and elasticity adjusts automatically to demand. Understanding service models helps organizations choose the right cloud strategy.

Microsoft 365 includes productivity apps and cloud services. Outlook manages email and calendars, Word creates documents, Excel handles spreadsheets, and PowerPoint creates presentations. Teams supports chat, meetings, and collaboration, while SharePoint hosts intranet sites and document libraries. OneDrive provides personal cloud storage, OneNote captures notes, and Planner organizes tasks. Microsoft 365 apps work together so teams can communicate, store files, and automate work. Understanding these services helps users and administrators choose the right tool.

Microsoft 365 security protects identities, data, and devices. Microsoft Entra ID manages identities, and multifactor authentication requires multiple factors. Conditional Access enforces sign-in policies, and data loss prevention blocks sensitive data sharing. Microsoft Purview provides compliance, eDiscovery, and governance tools. Sensitivity labels classify data, Information Protection encrypts and protects it, and Insider Risk Management detects risky activity. Administrators should enable security defaults, assign least privilege, and monitor compliance. These controls help organizations meet legal and regulatory requirements.

Microsoft 365 licensing determines which services users can access. Subscriptions are paid plans, and licenses are user entitlements. Microsoft 365 Business Basic includes web and mobile apps, E3 includes desktop apps and cloud services, and E5 adds advanced security and compliance. Volume licensing supports organizations at scale, and tenants are organization instances. The Microsoft 365 admin center manages users, groups, roles, and billing. Users are identities, groups collect users, and shared or resource mailboxes support team workflows. Usage reports show adoption and activity.

Microsoft integrates AI across Windows and Microsoft 365. Microsoft 365 Copilot assists users in Word, Excel, PowerPoint, Outlook, and Teams. Copilot in Windows helps with operating system tasks, and Bing Chat Enterprise provides AI chat with commercial data protection. Prompts are instructions given to AI models, and knowledge bases ground responses. Responsible AI principles include fairness, reliability, privacy, transparency, and accountability. Copilot Lab offers prompts and learning resources. Organizations should protect data, review AI output, and use AI responsibly.