The next version of WordPress, 3.2 is dropping support for Internet Explorer 6.
IE6 is not supported by many websites and Microsoft, its maker has just stopped supporting IE6.
“WordPress has terminated support for Internet Explorer 6 as it needed more and more complex code deception to make the WordPress dashboard work in the IE6 browser, which was commenced 10 years ago and does not support existing web standards,” the company said in the post.
More on 3.2: http://wordpress.org/news/2011/05/wordpress-3-2-beta-1/