| Feature | Office 2016 Pro Plus (Final build) | Microsoft 365 (current) | | --- | --- | --- | | License type | Perpetual (one-time purchase) | Subscription (monthly/yearly) | | Cloud storage | 0 GB (needs separate OneDrive) | 1 TB per user | | AI features (Copilot) | ❌ | ✅ | | Dynamic arrays, LAMBDA in Excel | ❌ | ✅ | | Real-time co-authoring | Limited (SharePoint only) | Full (web + desktop) | | Security updates | ❌ (after Oct 2025) | ✅ (continuous) | | Mobile/Web apps | ❌ | ✅ |