The application I use most of the time is a piece of software which understands how to talk http...the web browser.

 For my sins, the underlying o/s is Microsoft Vista but the main applications I launch were typically Firefox, Opera and (for testing purposes only due to its shocking sluggishness) Internet Explorer. I use the past tense because I was quick to download Google Chrome which I now use religiously due to that fact that it runs javascript heavy web 2.0 apps (Freshbooks, Basecamp, Lighthouse, Harvest, Highrise etc) with ease. To summarise - my application needs have evolved out of the realm of the raw file'n'folder o/s.

 Do I feel sorry for MS with this? Nah!. Bill knew "The Internet" was coming a long time ago but his ego and his belief in the Redmund Behemouth was just too big to think that there might be something out there which was bigger than them or that they could not control. Foolish.

 The web is the new o/s.