It does work in HTML, but not in a report. Like I've said in my original post, it just removes the hyperlink alltogether when I have a , or ; after mailto: (except when doing CC).

If you have an .rdl that works with mailto:1@1.com,2@2.com etc please share.

PS: Yes I'm using Outlook 2003 as well if it matters. (It doesn't in my case, because the hyperlink is not even clickable, so it doesn't go to the e-mail client)