Top Highlights

• Exchange Online Database Availability Groups (DAGs)
• Organizations can choose to distribute Exchange Online, SharePoint Online, OneDrive for Business, Teams, and Microsoft 365 Groups data across different datacenter regions (multi-geo). This means that the organization has a home region (known as the “central geo”) where most of their workload runs, and one or more satellite geos. Sites including tea...
• Distributing user data across multiple regions causes some technical challenges, one of which is eDiscovery. Organizations need to consider if they wish to run eDiscovery locally or at a global level. See this page for more information.
• The Microsoft 365 substrate is the single repository for user documents, email, meetings, tasks, groups, chats, and other data.
• Exchange Online mailbox databases are the physical implementation of the substrate.