You have custom-built internal applications (VBA/COM) that are strictly 32-bit dependent.

Despite sharing the same architecture, the features and support lifecycles differ across these three releases: Office 2016 Office 2019 Office 2021 Sept 22, 2015 Sept 24, 2018 Oct 5, 2021 Support Status Extended support ends Oct 2025 Extended support ends Oct 2025 Support ends Oct 2026 Key Features Focus on cloud integration and "Tell Me" help.

Microsoft Office 2016, 2019, and 2021 all offer versions to maintain compatibility with older hardware and specific software extensions . While Microsoft has shifted to 64-bit as the default installation for modern systems, the 32-bit architecture remains a critical alternative for specialized environments. Core Architecture & Compatibility