Life would be so much simpler if Microsoft would tell us what it's trying to put on our PCs. Earlier this week the mystery patch KB 3035583 was unveiled by German site heise.de as a shill for Windows 10. The patch is all about advertising Windows 10 and upgrading to Windows 10, from Windows 7 and 8.1 PCs. Now readers report the patch is marked as “Important” and installs by default through Automatic Update.

Others report that their Windows 7 PCs have KB 3035583 marked as Important. I have no idea why.

The patch itself is unchanged from when it was first released on March 27, according to the KB article. To date, we only have Microsoft's official description: “This update enables additional capabilities for Windows Update notifications when new updates are available to the user. It applies to a computer that is running Windows 8.1 or Windows 7 Service Pack 1 (SP1)