Duplicate emails in Hotmail


New Email
I have Outlook Express on my home PC set up to forward all our emails to our phones. My iphone (gmail) works fine. My wife's new Rage and her Nook, both with Hotmail, get duplicate email messages over and over again from home. How do I stop this? Since I get the messages at my office and on my phone without a problem I am assuming the problem lies in hotmail???