Microsoft donates Office 365 A1 for Education to eligible institutions so that students and educators can use it at no cost with a valid school email address. It includes web-based versions of Outlook, Word, Excel, PowerPoint and OneNote, Microsoft Teams, and Microsoft 365 Copilot Chat.
You can use the plan as long as you are working at, or enrolled in, a qualified educational organization, and eligibility may be re-verified at any time. If it expires, the apps drop to a reduced-functionality mode in which you can view but not edit documents, and you can extend by re-verifying your status. Verification is often instant, but an institution that needs checking can take up to a month.