| Solution | Cost | Permanence | Notes | | :--- | :--- | :--- | :--- | | | Free | Forever | Only restriction: a watermark and limited personalization. Full security updates included. | | Microsoft Office Web Apps | Free | Permanent | 90% of core features, works in browser. | | LibreOffice / OnlyOffice | Free | Permanent | Full office suite, compatible with MS formats. | | Microsoft 365 Family | $99.99/year | Active subscription | For up to 6 users, 1TB OneDrive each. | | Windows 10/11 OEM Key | $15–$50 (resellers) | One-time | Often grey-market but typically activates permanently. | | MassGrave (Open Source) | Free | 180-day renewal | A script-based alternative only recommended by security experts after code review. |
Antivirus software frequently flags these tools because they perform tasks similar to malware (bypassing security features). This is often a "false positive." HEU KMS Activator 42.3.1 Activator Windows