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Beware KB3139929
Those not intending to upgrade to Windows 10 should note that this week's Cumulative Security Update for Internet Explorer is understood (from MS's own documentation) to have an integral non-security patch embedded in it which provides "Updated Internet Explorer 11 capabilities to upgrade Windows 8.1 and Windows 7". That integral patch (KB3146449) is not separately listed when installed and cannot therefore be removed.
IE patch KB 3139929: When a security update is not a security update @ AskWoody
Security Update MS16-023 installs new "Get Windows 10" functionality - gHacks Tech News