Finally, Micro$oft knows how to do a silent update for your IE browser. Maybe just learned from Google Chrome or Mozilla Firefox.
Anyway, this is a smart move to stop or at least to slow down the loss of market share (to Chrome and Firefox). M$ won the browser war against Netscape by bundling IE to Windows since Windows 95. But is has been a loser in the same battlefield against Firefox, nor against Chrome.
Security, speed, and W3C standard are the major reasons tech geeks abandon IE. IE 8 and IE 9 did have some improvement in security and speed. But the compliance with standards is still not as good as Chrome or Firefox.
So, M$ silently updates the IE browser for most users; a lot of users will not know because they already switched to other better browsers.