id stay away from outlook if i were you. if you not happy with thunderbird try one of the many other ones available. id choose a open source on for security. the reson i wont touch outlook is almost all mass mailing worms will attack it and well ur a bit stuffed. use summin less popular and you stand a much better chance of preventing it from being able to spread dew to virus ritrs going for the most used product. aslo check out summin like vbs worm generator. it just highlights the issue. in under a min you can make a mass mailing vbs worm! dont use outlook. nuff said.