Here’s another interesting approach

Zimbra – Blog:

Like many other power users I have commiserated with, email became the most frustrating application I had to deal with, and it was the one that I was spending the most time on by at least an order of magnitude. How can it be that Yahoo! and Google are offering innovative, Web 2.0 email solutions with a gigabyte  of storage for free, while my corporate messaging is still stuck in the mid 90’s?