i have asked the server people to trace the mail and on there side, the mail example "Me" was send to him and received by him one 1 time. But when you look in his inbox, the same mail with same subject is like appearing 900 mails and still coming in. We have 3 exchange servers here. 2003, 2007 and 2010. Dont ask me why we have 3 exchange servers. We have users that runs from 2003 to 2010 office. But i have 2007 on my pc and the user that receive duplicate mails also has 2007 office. I cant say to my boss that there exchange servers is the blame for this, because we have users that has 2007 running on the 2007 exchange and the 2003 also on the 2007 exchange. My boss will say i have to figure this out and fix it. But if i downgrade the user from 2007 to 2003, then the duplicate mails stops. But the user needs 2007 to work on