Windows is transitioning from something that you buy once every few years to a service that’s updated on a regular basis. Windows 10 has only been out for a few weeks but already Microsoft’s got the follow-up ready for selected users to test. If you’re a member of the Windows Insider program, you can now get a look at Preview Build 10525 which’ll land on your desktop automatically via Windows Update.
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https://www.engadget.com/2015/08/19/windows-10-next-preview-build/