Hotmail blocking Firefox users again?

gehrehmee writes: "As indicated on the mozilla support forum, Microsoft's recent upgrades to Hotmail's user interface have broken many Firefox users' ability to send or reply to any mail. Firefox seems up to the job though, because a simple user-agent switch gets it working again. Is this more anti-competetive malice or just simple incompetence? Either way it's putting users in a tough spot: Either execute some non-obvious technical workaround, or switch back to Internet Explorer."