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How to add a dropdown list in an outlook meeting request by means of a custom add-in?

I want to create an outlook web add-in, (not COM or VSTO) which upon activation, will include a dropdown list with a predefined list of values.

However this dropdown list should appear in the red region, please see screenshot, and not in a task pane.

dropdown screenshot

The add-in will be for Office365

The outlook add-in tutorial only shows how to work with a task pane. Any idea on how I can proceed with this? any links or piece of codes are welcome.

Solution

  • Outlook Web add-ins don't provide anything for customizing the specified area.

    In case of COM add-ins, you may consider using Windows API for subclassing Outlook windows and injecting your own UI anywhere. See Creating Adjacent Windows In Outlook sample project.