You have custom-built internal applications (VBA/COM) that are strictly 32-bit dependent.
Microsoft currently recommends the 64-bit version for almost all users to leverage better processing power and security features (like Hardware-enforced Stack Protection). You should only opt for the if: ABOUT Microsoft Office 2016/2019/2021 32-bit
: While most VBA code works on both, 32-bit Office is required for older VBA code that uses 32-bit Declare statements or specific API calls without the PtrSafe attribute. Key Version Differences (32-bit) ABOUT Microsoft Office 2016/2019/2021 32-bit
Added Morph/Zoom in PPT, SVG support, and Data Analysis in Excel. Added Dynamic Arrays, XLOOKUP, and Dark Mode support. Windows 7 or later Windows 10 or 11 Windows 10 or 11 Performance Limitations ABOUT Microsoft Office 2016/2019/2021 32-bit