+1, I recommend FastMail's web client too if you like to manage your email and calendar using a browser. It's fast and snappy, has a clean interface (they have

+1, I recommend FastMail's web client too if you like to manage your email and calendar using a browser. It's fast and snappy, has a clean interface (they have a couple of themes you can choose from), and it's pretty lightweight (for example, a gmail tab uses 195 MB for me while Fastmail's uses 51 MB).