Ribbon is really great, but you cannot just use it for free for Office-competing products: &quot;There’s only one limitation: if you are building a program which directly competes with Word, Excel, PowerPoint, Outlook, or Access (the Microsoft applications with the new UI), you can’t obtain the royalty-free license&quot;<p><a href="https:&#x2F;&#x2F;blogs.msdn.microsoft.com&#x2F;jensenh&#x2F;2006&#x2F;11&#x2F;21&#x2F;licensing-the-2007-microsoft-office-user-interface&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blogs.msdn.microsoft.com&#x2F;jensenh&#x2F;2006&#x2F;11&#x2F;21&#x2F;licensin...</a><p>Except if you probably pay MS a royality fee.