The email service that is owned by Microsoft is called "Outlook." It was previously known as "Hotmail" before being rebranded as "Outlook.com." Outlook is one of the most popular email services in the world, offering features such as a clean and user-friendly interface, integration with other Microsoft products, and advanced security features. Outlook can be accessed through a web browser or through desktop and mobile apps on Windows, Mac, iOS, and Android devices.