Currently there is only support for SMTP addresses in the Exchange Module. Can X500 addresses be added? When users migrate from one forest to another the legacyExchangeDN changes, for autocomplete cache and emails internally this causes an issue and emails will bounce because the address doesn't exist. In alot of cases I would add the legacyExchangeDN as an X500 address on the backend, however if a new address is added to the mailbox via solidcp the X500 address is removed. Being able to add the X500 address can allow end user admins to resolve these issues themselves.