Last night Microsoft Update prompted me to install an update. I thought it was the updated definition files for Windows Defender and told it to go ahead. A little while later I was being prompted to restart my machine. I thought “What in the world? I haven’t ever had to reboot after a Defender definition update.” After the reboot I looked and saw that it was a patch to IE. I realized it was out of band and therefore probably very important. Today I have had several e-mails that look like the one below. Microsoft seems to want us to patch our machines.

Download urgent security update for Internet Explorer

Today Microsoft released an urgent security update for Windows Internet Explorer. Because the flaw may expose computers to remote code execution, the severity rating for this security update is critical.
From the moment we learned of the issue, Microsoft has been working around the clock to respond to this situation and provide a security update that helps protect our customers.
If you have turned on Automatic Updates, your computer will install the security update automatically. If you don't use Automatic Updates, go to http://update.microsoft.com. This update might cause your computer to restart.
For more information on this update, see the bulletin summary. For more information on how to protect your PC, visit the Microsoft Security At Home site.