Hi, I am getting mad at one problem with exchange server. I have one user whose mailbox is constantly sending read response to a message which is one year ago. I have tried deleting his mailbox and created a new one, deleting his NT account, reinstall OS. Almost everything that I could do. But the problem is still not solved. I am worried this might be virus. However it only happened to one user's mailbox. We are using Exchange 5.5 sp4 on NT 4.0 sp6a Could anyone help me????