Email Prioritizer is an Office 2007 addon from Microsoft Office Labs that helps you to get a grip over your email overload problem.
This addon adds a "Do Not Disturb" button to your office toolbar, which when enabled, temporarily pauses delivery of all emails to your inbox. Really usefull to work undistracted.
Another feature is the ability to rank incoming emails. Emails can be prioritized in a 0-3 star rating system making most important emails easy to find and process.
Email Prioritizer works with Outlook 2007 running on Exchange server.