Microsoft will be upgrading all Windows XP, Vista and 7 users to the latest IE silently. They are doing this because they have found a large number of non-patched systems. Microsoft pointed out that Chrome and Firefox do this regularly. They will start with Australia and Brazil in January, then go world-wide after they have assured there are no issues.

http://tech.slashdot.org/story/11/12...ersion-of-msie