Evolution
your mail needs are evolving; are you ?, how's your coccyx feeling ?

Buzzword compliant:
A platform for groupware component development
An integrated, internet personal information manager
Features:
Mail
Handles vast quantities thereof
V-Folders & filters
mbox, imap, pop,
Calendar - iCal / iTip
Contacts - iCard / LDAPs
HTML mail as an option
Executive Summary -
Need a www.theregister.co.uk component here
MS Exchange - mail only via imap - Luke