StarOffice 8 next month. Microsoft's Office system is bloated. Maybe. It's pricey. Maybe. (There's always the cheap Student/Teacher version with three licenses that nobody cares if you qualify for anyway.) But really, I live in Outlook. And between the integration of the various pieces, specialty parts like OneNote, and Microsoft-only features like ink support on tablets, it's actually pretty hard to switch. OpenOffice definitely is no FireFox, which in turn again isn't the whole solution, if you need things like ink support in the browser itself.
Are there actual Tablet PC users out there who openly prefer something like Star/OpenOffice or even WordPerfect's products, despite losing things like ink enhancements?