Windows Update breaks file sharing

We are closed today in observance of Yom Kippur.  We will open again in. . .

I just had a customer call because they could not connect to file share hosted on a Windows 7 Pro workstation from a Windows 10 Pro workstation.

They installed KB4480970 about 6 days ago.  This seems to be the cause of our issues.

Big thanks to the people over at Windows Report for breaking this story for us!