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Windows 10 is a series of operating systems developed by Microsoft. Microsoft described Windows 10 as an "operating system as a service" that would receive ongoing updates to its features and functionality, augmented with the ability for enterprise environments to receive non-critical updates at a slower pace or use long-term support milestones that will only receive critical updates, such as security patches, over their five-year lifespan of mainstream support. It was first released in July 2015. The eighth stable build of Windows 10, version 1903, codenamed "19H1", was released for general availability on May 21, 2019 after being on the Insider Release Preview branch since April 8, 2019.[58] Because of new practices introduced after the problems affecting the 1809 update, Microsoft used an intentionally slower Windows Update rollout process. New features in the update include a redesigned search tool—separated from Cortana and oriented towards textual queries, a n