Planning a Google Workspace to Microsoft 365 Migration? What Should You Consider?

You are planning more than a mailbox move: user mapping, calendars, contacts, coexistence, Drive content, and DNS cutover need separate validation. Inventory users, aliases, groups, shared mailboxes, delegated access, rooms, shared calendars, Drive ownership, and retention requirements. Verify the domain in Microsoft 365, assign licenses, provision every target user, and create the two routing subdomains required for staged coexistence. Use the Exchange admin center’s automated Google Workspace migration in a small pilot batch; it moves mail, rules, calendars, and contacts. Validate counts and representative items before expanding. Document limitations early: shared calendars, event colors, room bookings, Gmail labels, some contact fields, and oversized messages do not migrate identically. Move personal Drives to OneDrive and shared Drives to SharePoint or Teams with Migration Manager. Before cutover, lower DNS TTLs, freeze account changes, complete delta synchronization, switch mail records, and test internal and external delivery. Keep Google read-only until owners sign off.