This will be a significant change for Microsoft, which has previously considered all its apps to be core components of the operating system. Thus, you could not uninstall them without big hackery. The latest Microsoft Insider-built (version 18262) contains uninstallation for Microsoft's applications. In that build, Windows 10 supports uninstalling 3D Viewer, Calculator, Calendar, Groove Music, Mail, Movies & TV, Paint 3D, Snip & Sketch, Sticky Notes and Voice Recorder. Some apps like Camera, Edge, and Microsoft Store can not be uninstalled. You are also stuck with Cortana forever.
To uninstall these apps, right-click either tile or entry in the applist. Click "Uninstall" and they are gone. You can get your apps back later if you regret your decision – they are all in the Windows Store. But then you must use the Windows Store. It's a tough conversation.
If you're updated in October, there are already more apps you can uninstall like this. At the moment, Windows 10 supports removing Microsoft Solitaire Collection, My Office, OneNote, Print 3D, Skype, Tips, and Weather. You have always been able to remove the "extra" software Microsoft throws in with each Windows installation like Candy Crush Soda Saga and FarmVille 2.
Microsoft has delayed delays with several recent updates, and even then there are some show-stopping errors. Just earlier this month, Microsoft released its autumn update to Windows 10 with a nasty mistake that deleted the folders for some users. Microsoft drew the update, fixed the error and changed its Insider Program feedback mechanism in hopes of avoiding similar errors in the future.
The update that allows to remove all preinstalled apps will be the next major update in the spring of 2019. It is currently directed at April, but it may come a little later, as Microsoft certainly makes sure it does not turn it up. 2nd update in a row.
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