The date of execution is January 12 (next Tuesday). At that time, Microsoft will cease supporting Internet Explorer versions 8, 9, and 10. What that boils down to is no more technical support and, more importantly, no more security updates. Anyone who continues using the legacy browsers will find themselves at greater risk of attack.
Slowly but surely, Microsoft is pushing users towards Edge (shown above)
"Internet Explorer 11 offers improved security, increased performance, better backward compatibility, and support for the web standards that power today’s websites and services. Microsoft encourages customers to upgrade and stay up-to-date on the latest browser for a faster, more secure browsing experience," Microsoft says.
If it were up to Microsoft, everyone running Windows would upgrade to Windows 10 and adopt Edge as the their go-to browser. That hasn't panned out -- the upgrades are coming in fast and furious, but even Windows 10 users are loathe to give up Chrome or Firefox in favor of Edge.
That may change when Microsoft rolls out Edge support for extensions. In the meantime, Microsoft's doing the next best thing (in its eyes), which is limiting IE to a single version, making all other currently supported versions obsolete.