At least 10 GB of available disk space, formatted as HFS+ (Mac OS Extended) or APFS. Core Features in Outlook 2019 Update history for Office for Mac - Office release notes
Intel processor or Apple Silicon (compatible with M1-chip MacBooks). Memory: Minimum 4 GB RAM .
Volume License (VL), intended for enterprise and commercial deployment.
Uses Click-to-Run (C2R) for installation and updates, replacing the older Windows Installer (MSI) technology. System Requirements (macOS)
Microsoft Outlook 2019 VL v16.46 is a specific volume-licensed update for , released in February 2021 . This version was a standard monthly update for the perpetual license version of Office 2019, providing security and quality fixes rather than new feature sets. Key Product Details Release Date: February 17, 2021. Version Number: 16.46 (Build 21021202).
Supported on the three most recent versions of macOS at the time of release (typically macOS 10.14 Mojave, 10.15 Catalina, and 11 Big Sur).