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| Feature | Office 2019 (Perpetual) | Microsoft 365 (Subscription) | | :--- | :--- | :--- | | | One-time fee | Monthly/Annual recurring | | Cloud Storage | None (OneDrive optional) | 1 TB included | | AI Features | None (No Copilot, no Ideas) | Full AI integration | | Updates | Security-only (Frozen feature set) | Continuous new features | | Best Use Case | Air-gapped PCs, production lines, VMs | Collaborative teams, mobile users |