The platforms listed below have been tested for support. Other compatibilities may exist, but are not officially supported.
Desktop Client
| Platform | Edition | Support | Comments |
| Windows | 10 | Yes | |
| Windows | 8.1 | Yes | |
| Windows | 8 | No | Upgrade to 8.1 |
| Windows | 7 | Yes | |
| Windows | Vista and below | No | |
| Windows | Server 2016 | Yes | |
| Windows | Server 2012 (+R2) | Yes | |
| Windows | Server 2008 (+R2) | Yes | May require a restart |
| Windows | Server 2003 (+R2) | Yes | Support ends mid 2018 |
| macOS | Sierra 10.12 | Yes | |
| macOS | El Capitan 10.11 | Yes | |
| macOS | Yosemite 10.10 and below | No | |
| Linux | Any | No |
Mobile App
| Platform | Version | Support | Comments |
| iOS | 9.3+ | Yes | |
| Android | 6.0+ | Yes | |
| Windows Phone | 10.0.1+ | Yes | Support ends late 2017 |
| Silent OS | 3.0+ | Yes |
Outlook Plugin
The Outlook Plugin is only supported on Windows operating systems. Until recently, Outlook for Mac did not allow for the installation of add-ins.
| Platform | Edition | Support | Comments |
| Windows | Office 2016 | Yes | |
| Windows | Office 2013 | Yes | |
| Windows | Office 2010 | Yes | Issues in Outlook 2010 SP2 |
| Windows | Office 2007 and below | No | |
| macOS | Office 2016 | No | |
| macOS | Office 2011 and below | No |
Web Browser App
| Platform | Browser | Support | Comments |
| Windows | Edge 38+ | Yes | |
| Windows | Internet Explorer 10+ | Yes | |
| Windows | Chrome 54+ | Yes | |
| Windows | Firefox 50+ | Yes | |
| macOS | Safari 10+ | Yes | |
| macOS | Chrome 54+ | Yes | |
| macOS | Firefox 50+ | Yes |
