Why do I have some X500 addresses starting with //0=organization, instead of, /o=organization. It has two forward slashes instead of one.

There shouldn't be any with a double forward slash. I suspect this has come from a badly developed script or something. Typically, X.500 addresses come from migration scenarios (where there is a need to preserve the ability to reply to receipients whose mailboxes that have moved) or IIFP/MIIS GAL Sync. I'd be curious to learn whether the "//" addresses are usable. What happens when you copy one of these addresses and paste it into the "To:" field in a new message in Outlook and select "Check Names". Does it resolve back to the correct user in the GAL? Tony www.activedir.org