Microsoft Office LTSC for Mac 2021 v16.54 (specifically build 21101001) represents a critical release in Microsoft’s Long-Term Servicing Channel (LTSC) designed for specialized, regulated, or restricted enterprise environments. Unlike the standard Microsoft 365 subscription model, this version provides a "locked-in-time" experience that prioritizes stability over new feature updates. Microsoft Learn Core Purpose and Licensing The LTSC version is a perpetual, device-based license
. (Note: Access and Publisher are Windows-only and are not compatible with macOS). The Significance of Version 16.54 Version 16.54 was released around October 2021 Microsoft Office LTSC for Mac 2021 v16.54.zip