How to add 'add-in' button to show pop-up window in outlook home menu?

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Is there any way to add a button in home menu of outlook app? If I click a button, I want a particular website to appear as a pop-up window.

Any comments would be appreciated!

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VBA doesn't allow customizing the Fluent UI in Outlook. To customize the ribbon UI in Outlook you need to develop an add-in.

A rich customization is available for COM based add-ins, see Walkthrough: Create your first VSTO Add-in for Outlook to get started quickly. You may find the Walkthrough: Create a custom tab by using the Ribbon Designer helpful.

Another possible route is web-based add-ins. See Add-in commands for Outlook for more information. There is no so much flexibility like with COM add-ins, but the solution allows to support multiple platforms - Web, Mac OS, Windows.