how to add custom ribbon button on meeting/appointment window in microsoft outlook 2013,2016

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need to add ribbon button on highlighted place(button 1 and button 2) in the appointment/meeting screen(see the link for image) of outlook near the Alldayevent checkbox?

Image Link

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c#wpfvstooutlook-addin
Welcome to SO. Can you show us your code. What have you tried so far? – cSteusloff
sorry...not allowed to share. – Neha Soni

2 Answers

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That area is not customizable, at least not using any public Outlook API.

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You can add a custom UI to the ribbon only. The Fluent UI (aka Ribbon UI) is described in depth in the following series of articles:

Also, you may consider creating a form under the ribbon/subject field on your own subclassing Outlook windows. Read more about that on the Creating Adjacent Windows In Outlook page.

FYI Add-in Express provides the TopSubPane layout out of the box which allows placing like shown on the screenshot:

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