Microsoft Phones refers to the line of smartphones that were developed and marketed by Microsoft Corporation. The most prominent among these were the devices running the Windows Phone operating system, which was introduced in 2010 as a competitor to Apple's iOS and Google's Android.

The Lumia series, acquired from Nokia in 2014, became the face of Microsoft Phones. These devices were known for their integration with Microsoft services like Outlook, OneDrive, Office, and Cortana, the personal digital assistant. They also featured a unique user interface centered around live tiles that provided dynamic updates from apps directly on the home screen.

However, despite some positive reviews for design and user experience, Windows Phone and subsequently Microsoft's own phone hardware efforts never gained significant market share against the dominance of Android and iOS. Microsoft eventually scaled back its phone business, ending production of new Lumia devices and shifting its focus more towards software and services.

In recent years, Microsoft has shown renewed interest in the mobile space with the launch of the Surface Duo and Surface Duo 2, which are dual-screen Android devices, marking a departure from the Windows Phone OS. These devices are part of Microsoft's Surface lineup and represent their current offering in the smartphone market.

Yealink, a company known for producing enterprise communication solutions, does offer a range of IP phones that are certified for use with Microsoft Teams and Skype for Business. When referring to "Yealink Microsoft Phones," it typically means these specialized IP desktop phones designed to integrate seamlessly with Microsoft's communication platforms.

These phones are designed to enhance the productivity of office environments by providing direct access to features of Microsoft Teams or Skype for Business, such as making calls, joining meetings, accessing contacts, and more, right from the phone's interface. They often come with dedicated buttons for common Teams functions, high-definition audio, and compatibility with Microsoft's cloud-based phone system.

Some examples of Yealink phones optimized for Microsoft include the Yealink MP Series, CP965W, and the specifically Teams-certified models like the Yealink VP59 Teams Edition and Yealink MVC series for video conferencing. These devices aim to provide a native Microsoft Teams experience for users who prefer a desk phone over using the Teams app on a computer or mobile device.