Microsoft finally retired Internet Explorer 8, 9, and 10 yesterday, after previously encouraging everyone to upgrade to Internet Explorer 11.
There's another reason to do so, even if you don't use Internet Explorer, according to Microsoft Senior Software Development Consultant Pat Altimore, who notes components of the browser are tied into the operating system.
Conversely, not upgrading could affect things outside of IE that require HTML display or execution of particular scripts, for example.
"[It] could result in some Windows components not being serviced," explains Altimore. "To ensure applications using components (e.g. Web Browser control) are fully patched, update to the latest version of IE and apply future cumulative IE updates."