Until July 29, Microsoft’s mission will be to polish, polish, polish Windows 10. With build 10240, released on Wednesday, the buffing brush has been taken to Microsoft’s Edge browser. But there’s a catch: the Office 365 subscription hammer’s coming down on the Office apps.

Microsoft released build 10240 on the Fast Ring of the Windows Insider program, via the Windows Update service. The update uses Microsoft’s “production” channels, as a test to see if they can withstand the millions of downloads that will take place on July 29.

The download identified itself as “TH1 Core 100240” under Windows Update, and will lack any signifying number on the desktop. (If you’d like to check the version number yourself, you can: Search for “winver” using the Cortana search function on your PC.)

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