Nope, it doesn't. In fact, the RC version doesn't even come with WIndows Mail. The default is to use a web based email system (Windows Live Mail). You can download an email program which is like the next gen of Windows Mail but you need a browser to do it! So, unless you've previously downloaded a browser and saved it to some form of external device a new Windows 7 install will be stuck with no browser and (unless they change it in the final release) no email program.
Good thinking guys. Flipping EU. Knickers in a knot over nothing and now it's gonna cause a lot of confusion when 7 rolls out.