Microsoft 365 uses the concept of a "tenant" to securely isolate each customer's data, users, and permissions, even as they are running on shared infrastructure. Most applications run within a single tenant, and would require a separate copy of the app for each tenant.

In this session, you'll gain a deep understanding of tenants and the new Multi-Tenant Organizations (MTO) feature. We’ll demystify the various types of users – internal, external, members, and guests – and show how they work for users and Entra ID administrators. Then you'll learn how enterprise and 3rd party applications work within this environment, how to write multi-tenant apps, and how to manage access as a tenant admin.

This is not only important to software vendors who sell SaaS solutions to many customers, it’s also relevant to customers who find themselves with multiple tenants due to mergers and acquisitions and other partnerships. Please attend to fully understand how multitenancy works in Microsoft 365, Microsoft Graph, and the apps you write and use every day!