However, many air-gapped systems, industrial control workstations, and legacy enterprises still use Office 2016 because of specific add-in or VBA macro compatibility. If you are using this version, it is strongly recommended to disconnect it from the internet or use strict network isolation.
64-bit version is recommended for Excel workbooks with large datasets (>2 GB), but may have compatibility issues with older 32-bit ActiveX controls and add-ins. many air-gapped systems