I have Exchange 2003 Enterprise running on Windows Server 2003. Once in awhile when I create an active directory user it fails to create an Exchange mailbox and email address. I’ve run into this on occasion. Sometimes I can do an update on the RUS. Other times I have to reboot the server to resolve the issue. I’ve run into this issue with 2003SBS as well. Unfortunately, this happened with the last user I created. I can reboot the server when we’re out of production. It’s just a pain to have to do it. I ran an update this time on the RUS and it did not resolve the issue in this instance. :?