Hello, I have a user on Exchange 5.5 whose address now shows in X500 encapsulated format such as... <IMCEAEX-_O=testdomain_OU=test+2ECA_CN=RECIPIENTS_ > ...etc. He is the only one with this problem. I have a mixed mode Exchange environment (E2K3 and E5.5) Does anyone know what the cause might be? and how to solve this issue? Thanks, Ghassan