On July 29, 2015, Microsoft unveiled Windows 10, integrating the live tile interface with the classic Start menu and focusing on the desktop experience. It was developed with public collaboration through the Windows Insider Program. Microsoft offered a free upgrade to Windows 7 and 8 users for one year, which was later extended until 2023, resulting in 100 million devices running Windows 10 within two months of its launch. The "Get Windows 10" app aggressively promoted the upgrade, leading to user backlash and its eventual removal. Windows 10 faced criticism for extensive data collection practices, with no option for complete telemetry disablement. It introduced "Windows as a Service" with a biannual update schedule, though it faced issues, including data loss in the October 2018 Update. The OneCore project aimed to create a universal Windows core for various devices but ultimately faltered. The dark mode feature had inconsistencies, and Windows 10 Mobile struggled in the smartphone market, leading to its discontinuation in 2017. The Universal Windows Platform (UWP) faced adoption challenges, and the Fluent Design System delivered minimal updates. The My People feature was disabled by default due to poor adoption rates. Windows 10 played a crucial role in shaping the current Windows landscape and laid the groundwork for future developments.