Only if you abuse your statistics and choose numbers from different sources - 65% is the lowest figure for present market share and 85% is the highest for last year (http://en.wikipedia.org/wiki/Usage_share_of_web_browsers).
It's true that Microsoft are losing marketshare with IE, I'm not denying that. But I seriously doubt it's "becoming irrelevent". It's much easier to lose marketshare when you dominate a market than it is to gain it, they now have increased high-profile aggressive competition on Windows from both Apple, who are bundling Safari via iTunes Update, and Google, who are pushing Chrome on OEMs and via their search engine. Microsoft also have no version of IE for rival operating systems, particularly at a time when Apple's desktop market-share is increasing, so clearly if their desktop market share drops by 5% in a year, then that's up to 5% fewer people running IE. I actually think IE's usage figures have held up surprisingly well, considering.
It's true that Microsoft are losing marketshare with IE, I'm not denying that. But I seriously doubt it's "becoming irrelevent". It's much easier to lose marketshare when you dominate a market than it is to gain it, they now have increased high-profile aggressive competition on Windows from both Apple, who are bundling Safari via iTunes Update, and Google, who are pushing Chrome on OEMs and via their search engine. Microsoft also have no version of IE for rival operating systems, particularly at a time when Apple's desktop market-share is increasing, so clearly if their desktop market share drops by 5% in a year, then that's up to 5% fewer people running IE. I actually think IE's usage figures have held up surprisingly well, considering.