Jim (and Glynor perhaps?),
Windows Essentials has a reasonable mail thing I think. I use the web interface for Outlook.com, but when my Dad upgraded to W8 he was spitting feathers over the Mail app until he found Windows Essentials.
I meant, and I think Jim meant, for Metro.
I use Gmail, so I don't care about a desktop application at all. I wanted something I could browse and read a message with from my couch with my remote. The included Metro Mail app
could work beautifully, but keyboard-only navigation doesn't work right. Once you open a message, there's no way to get back to the messages list without picking up a Mouse. You can get down "in" that far easily, but you can't go back. Worse, a bunch of the keys you could easily use for this do
absolutely nothing (ESC, Left Arrow, etc).
The Weather app is similar. You can slide the view to the right and left with the arrow keys, but when you "focus on" the center radar/maps pane, it seems like you can't select any of them. Actually, you can, you just can't directly control (or see) what you are selecting. It is all messed up. It is clear that there is a "cursor" somewhere in there (a focus point), but since it is designed to be touch-only, you can't see it, and it isn't easy to control it. So, focus on those Weather maps and hit enter. Sometimes, one of them will open. You can switch which one opens by both positioning the application in the window (using left/right), and maybe by hitting up/down, but you can't really "control" it.
This is common in Metro apps if you're trying to use them with a remote. They
could work perfectly (based on UI and design concepts) but the keyboard controls just aren't there (or, more often, are half-way there).