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The Register reports on an angry thread on Microsoft's support forums filled with Windows Mobile users complaining that the Mail and Calendar app no longer opens after an automatic update to version 16006.11001.20083.0.
What's great is that you can use the app on both Windows 10 computers and the Xbox One. However, reports emerged later of similar problems on PCs that had only ever run Windows 10.
The only nice thing about the Pro Upgrade license is that they are supposed to be transferable to a different device once the device that the Pro Upgrade is installed on has had the OS downgraded back to the home version. A Reddit user said that upon restarting the PC, the license got converted to Windows 10 Enterprise for Virtual Desktops so clearly there's something wrong with Microsoft's activation servers. This issue does not appear to be isolated and is impacting a significant number of users.
In an updated advisory, Microsoft writes under the Windows 10 known issues:After installing this update, some users can not set Win32 program defaults for certain app and file type combinations using the Open with... command or Settings Apps Default apps.
So, in the event your license got deactivated on its own, just leave it as is and your PC should automatically get activated as soon as Microsoft fixes the activation server issue.
If you are facing the issue, you can resolve it using the Activation troubleshooter, located in the Windows settings, under the Update and Security. The message also gives users the option of purchasing a new key to reactivate their copy of Windows 10 Pro, despite users having a genuine Pro key.