[rpfeffer]

This really makes absolutely no sense. RIM is saying it's a microsoft issue, but it isn't, because I can send between 2010 and 2003 with no problems in all directions when logged in to 2010 OWA. The only place the problem is and the bounce back is generated is when sending from a BlackBerry device associated to a 2010 mail account to 2003. I'm at wit's end and RIM hasn't been much help.