Because version 15.6.1 is no longer the current release, you will not find it on Microsoft’s front-facing website. Searching for “free download” on third-party sites can lead to malware, adware, or corrupted disk images. Only use trusted sources.

| Application | Compatibility | Best For | | :--- | :--- | :--- | | | macOS 10.9 – Sonoma | Free, open-source, IMAP/POP support. | | Microsoft Outlook for Mac 2019 | macOS 10.13+ | Modern features but requires a new license. | | Mail.app (Apple Mail) | Included with macOS | Simple, fast, but lacks Exchange calendar integration. | | Airmail | macOS 10.11+ | Third-party client with modern UI but lower resource use. |

Whether you are trying to maintain a workflow on an older macOS version, you are troubleshooting a plugin compatibility issue, or you simply prefer the interface of the 2011/2016 transition period, this guide covers everything you need to know about this specific version of Outlook.

Subscribers can log in to office.com to download the full, most recent suite of applications. Version 15.6.1 Compatibility & Technical Details