Yes, it is from Microsoft. This is your notification that you can download and update to Windows 8.1 for free from the Windows Store:
Since you have Windows 8, you can update to Windows 8.1 for free by
going here and selecting
Get the update, even if you haven’t seen the notification on your device yet. Windows 8.1 has new features and enhancements to make Windows faster and easier to use. Learn more about Windows 8.1 by going to our
What’s new in Windows page.
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