Thank you. Outlook 2007 and 2010 have a) flags, b) user-taggable-color-coded categories, c) an extremely usable ToDo bar, and d) Xobni and a million other plugins that attempt to prioritize your incoming mail automatically.

I'm not saying Outlook works for me (it doesn't), but it's annoying that the author pretended Outlook doesn't exist, and essentially proposed his version of Outlook as a solution to the "problem".