I'm an expert of Outlook Plugin development, I developed many Outlook plugin and Macro during my work. All my bidding projects here are related to Office plugin, I finished them on time and got very good feedback, and you can refer to my finished projects for this.
So you need a Mac Outlook Addin to have the same feature of Windows Outlook Addin, is it correct?
But unfortunately, the Outlook on MAC doesn't support same add in feature with Windows, normally it is not possible to have the same addin feature.
However we can use script in MAC Outlook to do some work, but that will be limited.
Could you let me know what's the feature of your Windows Outlook Addin, then we can know whether it is possible to implement it on MAC.