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Message content options are determined by the type of system you are connecting to. If you want to use an X.400 system as a backbone to communicate with another Microsoft Exchange Server site or organization, you may be able to use Microsoft message database encoding format (MDBEF) format. The MDBEF format is the internal message format used by the information store. With MDBEF, no conversion is required, and the message content can be transmitted in compressed form, which reduces the overall load.
Some systems may not recognize the MDBEF format. If this is the case, choose a standard X.400 message format.