Why?

Why
Security
Address formats
What can I send?
Browser issues

It's cross platform
As long as you have an Internet browser for your Operating System you can use the WebConnect service.

You can use your own preferred browser
No need for you to get to know yet another mail application. You can use your own familiar browser.

It's the ultimate thin client
There really is nothing to configure on the Client side. All the user needs is a browser and the URL where he/she can find the WebConnect site.

Accessibility
As long as there is some dial up connection, a user can send, receive and check messages using a browser. Users are no longer bound to software installed on their PC's or laptops.