And because it's from Microsoft, you're going to keep paying for it, over and over again!
Windows update? That's gonna cost you an hour. Update got botched? 2 hours, and all of your browser settings. Registry corrupted?!? 3 hours for backup and reinstall! Can't figure out how to change a setting, because the option used to be there, then disappeared in the last update? 1 hour searching SO, 1 hour crying.