Microsoft Office for Mac has been around forever. In recent history, since 2015 or so, rather than waiting for a single great big new version every few years, Office now receives an update every month, and these updates bring both new features and bug fixes.
The one-time purchase also gets monthly updates until three years after its original release date, and then two years of security updates and bug fixes (but no new features) after that. There are also a few features (like ribbon customization) available only to 365 subscribers, though Microsoft doesn’t list what they are; they just call them “Premium,” as opposed to “Classic.” (Thanks, Microsoft!)
Release notes for all versions going back to version 15.30 (January 2017) are here and downloads to old versions are here.
Here’s a list of some of the significant versions of Microsoft Office for Mac that have been released, for history and reference.
Office for Mac 16.49 (June 2021): current version
Office for Mac 16.43 (Nov 2020): final version to support macOS 10.13 High Sierra
Office for Mac 16.42 (Oct 2020): first version to introduce “new Outlook” option (Microsoft) (The Verge) (The Register)
Office for Mac 16.29.1 (Sept 2019): final version to support macOS 10.12 Sierra
Office for Mac 16.17 (Sept 2018): first version of Office for Mac 2019
Office for Mac 16.16.27 (Oct 2020): final bug fix and security update for Office for Mac 2016; final version to support macOS 10.10 Yosemite and 10.11 El Capitan
Office for Mac 16.16 (Aug 2018): final “feature-freeze” version of Office for Mac 2016, with future updates only containing bug fix and security updates
Office for Mac 16.9 (Jan 2018): first “Windows unified code” release, follows version 15.41 from Dec 2017; starts at .9 because lower numbers were pre-release versions (Jamf Blog)
Office for Mac 15.25 (Aug 2016): first 64-bit version; optional final 32-bit variant available via separate download (Microsoft)
Office for Mac 15.14 (Sept 2015): first version of Office for Mac 2016 available in one-time purchase edition
Office for Mac 15.12 (July 2015): first version of Office for Mac 2016, for 365 subscribers only. This is a little confusing. Currently, the software is just called “Office”; “Office 2019” only refers to getting it by one-time purchase, rather than subscribing. But, for versions 15.12 through 16.16.27, the software itself was called “Office 2016”, and was initially only provided to those paying for Office 2011 via a 365 subscription, before being made available as a one-time purchase a couple of months later. (Microsoft)
Outlook for Mac 15.3 (Oct 2014): first major new Office app version released after Office 2011, released only to people paying by 365 subscription; released several months before the rest of the refreshed Office apps, which appeared in version 15.12 (Microsoft) (Talking Moose via Google Cache)
Office for Mac 14.7.7 (Sept 2017): final version of Office for Mac 2011; final version to support macOS 10.5 Leopard through 10.9 Mavericks
Office for Mac 14.0.0 (Oct 2010): first version of Office for Mac 2011
Entourage 13.1.6 (late 2013?): final version of Entourage Web Services Edition (same compatibility as Office 12.x)
Entourage 13.0.0 (Aug 2009): first version of Entourage Web Services Edition (predecessor to Outlook for Mac); optional supplement to Office 2008 (Microsoft)
Office for Mac 12.3.6 (Sept 2013): final version of Office for Mac 2008; final version to support macOS Tiger; final version to support PowerPC based Macs
Office for Mac 12.0.0 (Jan 2008): first version of Office for Mac 2008