The technical requirements for the add-in differ from device to device.
...
| Classical Windows Add-in | Modern Office Add-in | |
|---|---|---|
| Windows | - Outlook 2010, 2013, 2016 - .net Framework 4.5 - JIRA 6.0 or higher | - Outlook 2013, 2016 - Office 365 subscription or Exchange Server 2016 CU5 |
| Mac | n/a | - Outlook 2016 - Office 365 subscription or Exchange Server 2016 CU5 |
| Web | n/a | - Office 365 subscription orExchange Server 2016 CU5 |
| iOS | n/a | - Outlook Mobile App - Office 365 subscription |
...