I created an Outlook add-in to connect OUtlook with notion. When a user tag a specific appointment with a specific tag, it sends it to a notion database.

Now I want to know if it’s possible to first detect when a user open an Outlook event (to run code when this event occurs). Secondly, I want to know if it’s possible to display a message on the appointment UI box ? (something like “Do you want to tag this event ?”)

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For example, when my add-in detects in subject appoitments terms like “Board_meeting”, I want to display a message to my user.

I try LaunchEvent, Eventype but nothing only related with the fact to open an appointment. I found something like item.open in VBA but I only want to use JS/Typescript.