Question: We have created outlook[standalone application] add-in for Windows using joa addin based on the following link <https://github.com/wolfgangimig/joa>. We need the same to be done for Mac OS also.
 As joa is based on COM technology, we are unable to use it for Mac. Kindly suggest me the steps to create outlook add-in for Mac OS. Share some links if any code is available for creating outlook add-in for Mac.

Answer: 
I too created outlook custom addin for windows using joa.As joa uses windows registry for saving data it works only on windows.Refer this link <https://learn.microsoft.com/en-us/outlook/add-ins/quick-start?tabs=visual-studio-code> for Mac os.
Mac version of Outlook does not support COM based addins - they are Windows specific. It only supports JS addins (also supported by the Windows, iOS, and Android versions of Outlook) - see <https://learn.microsoft.com/en-us/outlook/add-ins/>