Yesterday I discussed how Google's Gmail Priority Inbox feature is aimed at combating Microsoft Office 2010 and SharePoint 2010 by providing a more efficient messaging experience . I still believe that is one of Google's goals with Priority Inbox. I use Exchange 2007 for work e-mail and Microsoft simply doesn't offer this sort of filtering by importance or even preference. It's not in Office 2010 or SharePoin 2010 either, from what I can tell.