Yes, Microsoft uses Umbraco as the content management system (CMS) for some of its websites. Umbraco is a popular CMS that is written in C# and is based on the Microsoft .NET framework, so it is a natural fit for Microsoft’s web development projects.
According to the Umbraco website, Microsoft has used Umbraco to power a number of its websites, including the Microsoft Partner Network and the Microsoft Virtual Academy.
Microsoft has also sponsored the development of various features and tools within the Umbraco platform.
It’s important to note that Microsoft uses a variety of CMS platforms and technologies for its websites and digital content, depending on the specific needs and goals of each project. Umbraco is just one of the many tools in Microsoft’s web development toolkit.