We're testing IE10 Preview on Windows 7. If you try and use the Tableau Forums you get an unsupported browser error - shown below. Not testing on IE10 on Windows 8 as no available PC.
Announcement: Jive end-of-life support for Internet Explorer 6
Thanks for the heads up on this. We're working to address with an update to the forums.
In the meantime there is a short term workaround that should work while you're on the Tableau Community site:
Running IE10 in IE9 mode: