Microsoft has now finalized Windows 10, ready for its release later this month. Sources familiar with Microsoft's plans tell The Verge that the software giant has selected build 10240 as the final release to manufacturing (RTM) copy, allowing PC makers to start loading the software onto new machines ready for release. We understand that Microsoft is signing off on the build internally today, and may announce the RTM publicly by the end of the week or choose to ignore the milestone and focus on the launch. While Microsoft is planning to launch Windows 10 on July 29th, new PCs with the software won’t be available until some weeks later. Microsoft is now pushing for existing and new device owners to upgrade to Windows 10 as part of a new marketing campaign.

Read next: Our Windows 10 review.

Microsoft will first roll out build 10240 to its Windows 10 testers, and the company is now focused on patches and fixes that will also roll out alongside the OS launch. While the RTM process is a milestone for Microsoft, especially almost 20 years to the day the company finalized Windows 95, it’s really just one step in a new model that will see Windows act more like a service. In the future Microsoft will be updating Windows 10 regularly, especially the built-in apps that power most experiences in the operating system. Microsoft will test these future updates with its Insider program first, before rolling them out more broadly over the coming months.

Verge Video: Windows 10 build 10056 on a tablet