Microsoft Office now supports Add-in on Mac. Office Add-ins allows users to extend the functionality of Word, Excel, PowerPoint, and Outlook. Office Insiders in the Fast Ring can now try out this functionality.
If you are Office Insider member, make sure you have Office build 170124 for Mac or greater. Now Open Word, Excel or PowerPoint and launch the store from Insert->Add-ins->Store. The Outlook Add-ins for Mac available at the Outlook store on Home>Store. Search and install an add-in that uses commands.
Previously, Add-ins was available only on Office for Windows Desktop and Office Online. Microsoft also launched new Outlook app with Add-ins support on iOS devices. This new feature will come to Android and Windows 10 Mobile devices later.