Im working for a Holding company in Turkey and we are organizing exhibitions (and also conferences during exhibition) and publishing magazines with the same topic of exhibition. Anyway, I need to keep in touch companies all over the world and I usualy do not remember what I have spoken with them, when I contact with them, where I met, what we have spoken etc. And also sometimes I have to announce new informations to all of them by e-mails. do you know any professional computer program to handle it?