1. web based storage of emails
2. a good web interface.
As for 1., I stil have not found anything really interesting that comes for free.
As for 2., I was once using Mutt and found it quite efficient, and am now thinking to try out sup. However, there is still this feeling that there could be a better client when it comes to usability and ease of installation. Using Mutt on Windows can be really annoying.