An anonymous reader writes "ZDNet reported earlier this week that Microsoft was thinking of offering an Ad-Supported version of Windows. A blog post by John Carroll offers some reasons why Ad-Supported Windows makes sense. From the article: '4. More revenue through targeted marketing: The holy grail of marketing is to target an audience with the sort of ads that most appeal to them. Sending a bunch of male programmers advertisements for breast enlargement isn't terribly useful. Sending a bunch of male programmers advertisements for a four hour extended version of Star Trek: The Wrath of Khan is useful.' Is there any situation where you can see yourself open to the possibility of using an Ad-Supported operating system?"