Excuse me if this sounds a litle critical or sarcastic. It isn't meant as such - only an observation.
After two years of criticism of some minor features in Vista, particuarly the sidebar and Windows Mail, sites such as this are now flooded with hints and hacks on how to recover those features in "7",
Are we humans naturally perverse? I do believe that it qualifies the views of many, incuding myself, that Vista was not the problem, but the nature of the users!
What is actually wrong with having the gadgets floating, instead of in an obtrusive window of their own. Why not use the taskbar, which is there anyway and can be "auto" hidden.
What is wrong with installing Windows Live mail (Free), instead of those fiddles to get windows Mail going again. It does everything Windows Mail does, plus a wee bit more.