Conversation view

Conversation view is a popular way to group e-mail threads, in which both own and others messages are grouped in the same view.
Here is a better description http://mail.google.com/support/bin/answer.py?hl=en&answer=5900.
Since now only (AFAIK) Gmail and Hotmail have the option to enable "conversation view". That's why many users are still stuck with Gmail and unable to switch to GMX.
On client side, only few clients have this option (e.g. Outlook, Apple Mail, Postbox).
Can you please add this feature to your webmail?