I'm guessing for nothing too taxing it will be fine. My local file/web server is pretty much equivalent to an Atom and does far more than web/mail serving.
This is where using RoundCube and IMAP might be suitable because 500GB space is more than enough for email storage.
You're probably right for the things you're going to do with it. If you are going to encrypt many connections it might be a little slow depending on the encryption type.
Very cool. I guess it's just when I hear Atom it takes me back to when I had one in a netbook and it was pretty shit. They have improved, and that guy proves it!
All depends what you wanted to do with it and probably how much RAM you had in your netbook.
Like I said, for some simple serving/hosting they are more than upto the task.
My caer.me server's hosted with them, on that same package I think. For my low-volume usage it's been perfectly fine, and having an actual dedicated server is really nice.