Outdated forum posts claim that early RTM builds have specific security loopholes that certain "KMS" (Key Management Service) activators can exploit. This is largely myth. Microsoft patched most local KMS emulation vulnerabilities long ago.
End of support for Office 2016 and Office 2019 - Microsoft Support
Many users despise the recurring cost of Microsoft 365. They seek a "perpetual" (one-time purchase) version. However, a legitimate perpetual license for Office 2016 still requires a paid product key.
