Had the same problem as everyone else. Manually downloaded and installed the (full) definitions files fromWindows Defender Offline (x64) DefinitionsWindows Defender Offline (x86) Definitionsand everything was fine.
What the heck is going on with this?
Not panicking, just annoying to have to remember to manually update, that's all.
Not sure if Microsoft has MLK day as a holiday but I'm sure they'll kick their server(s) back into service soon.--Don't feed trolls--it only makes them grow!
We do not. //A