Once you leave the coziness of your home to go back to corporate land where most of us have to go to earn their living, you will quickly find out that the poster was right: Most of the time there is no way around using Internet Explorer. Most corporate Intranets require IE to work properly. And while Sharepoint also works acceptable with Firefox nowadays, it's only really comfortable to use with IE. And since Sharepoint has become a de facto standard in many corporate environments, you know what browser you want to use with it.
And that, once again, leads us back to this reality: Apple is not a player in the corporate field. They're a consumer brand.
Yeah, all true. But the poster's puke was also justified. I work with all the mentioned "standards" and products and to put it in the words of Steve Jobs: "they are a big bag of hurt"...