Currently, around 50% of IE users need to update Internet Explore to latest available version by 2016, as documented in study below.  While this was announced over a year ago, more progress will be needed especially for corporate users which may be on older browser versions due to legacy websites and their compatibility with more modern browser standards.   We are now only four short months away from deadline

http://www.computerworld.com/article/2955918/web-browsers/patch-halt-looms-for-half-of-all-ie-users.html

With just over four months left before Microsoft stops serving security updates to most versions of Internet Explorer (IE) other than IE11, nearly half of all IE users are still running a soon-to-be-retired edition, new data released Saturday showed. In August 2014, Microsoft abruptly told virtually all IE users that they needed to be running IE11 by Jan. 12, 2016, or face a shut-off of security updates. After that date, Microsoft will support IE9 only on Windows Vista and Windows Server 2008; IE10 only on Windows Server 2012; and only IE11 on Windows 7, Windows 8, Windows 8.1, Windows 10, Windows Server 2008 R2 and Windows Server 2012 R2.

As of the end of July, 49% of all IE users were still running versions other than IE11, according to statistics published by analytics vendor Net Applications over the weekend. Through July, 50.3% of all instances of IE were IE11, Net Applications said. Substantial fractions of the IE user base, however, continued to run editions slated for shutoff, notably IE8, which accounted for 24.6% of all copies of the browser. But IE9 (13.6%) and IE10 (9.6%) also remained in wide use.