You would create an outlook addin which are written in JavaScript and work with the app or online version. See
https://learn.microsoft.com/en-us/office/dev/add-ins/quickstarts/outlook-quickstart-yo
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Hi,
Aim: I want to add a new tab in the web outlook, the tab will be in the ribbon.
There is any way to achieve that the tab will includes a buttons that trigger an API for sending email or do something else.
Thanks in advance,
You would create an outlook addin which are written in JavaScript and work with the app or online version. See
https://learn.microsoft.com/en-us/office/dev/add-ins/quickstarts/outlook-quickstart-yo