The problem of sending messages from the participants page is that it's not really that straight-forward (from novice users' perspective), as you have to go into the "Participants" link (from the "People" block), then use the "Select all" button (or, use the NOT_SO_USER_FRIENDLY checkboxes to click one by one), then look for the pull-down menu (which is sort of hiding on the bottom of the page), then select the "Add / send message".. there are a lot of steps, not to mention that the "Add / send message" feature does NOT support (1) Adding a "Subject" line to your message/email, (2) Groups, (3) Email attachment(s), (4) Email history, (5) Possibility to use "external email client" (e.g. Exchange, Thunderbird, etc.), and (6) capability to allow/restrict students to use this feature. Quickmail (and the "Quickmail for large classes") support all these. This is just my 2 cents. I will also vote for adding this to the core too so that the codes can be cleaned up a little bit by other core Moodle developers, and be constantly maintained. Besides, I will be reassigned to handle other projects in our campus in the near future, so I might not have time to keep maintaining the Quickmail projects in the future. Thanks!