Microsoft releases two new Windows 10 previews and introduces Windows App Preview Program

Microsoft today released two new Windows 10 previews for PCs. This is a rare occurrence for the Windows Insider program, though builds are sometimes released in quick succession. The first build is part of the RS4 branch, which represents the next Windows 10 update the company has yet to announce (but is likely to ship soon), and the second build is from the RS5 branch, which represents the Windows 10 update that will arrive much later this year. Oh, and Microsoft also introduced the Windows App Preview Program today.

Windows 10 is a service, meaning it was built in a very different way from its predecessors so it can be regularly updated with not just fixes, but new features, too. Microsoft has released four major updates so far: November Update, Anniversary Update, Creators Update, and Fall Creators Update.