Yes, you can use Microsoft 365 offline, but with some limitations. Applications like Word, Excel, and PowerPoint can be used without an internet connection if they are installed on your device. However, you need to connect online at least once every 30 days to verify your subscription. OneDrive files set for offline use are accessible, but cloud features won’t sync until you're online. Outlook allows access to previously downloaded emails. To manage your account, renew subscriptions, or access web-based apps, you must visit portalofficecom. Offline access is useful but requires periodic online verification for full functionality.