This section focuses on using the X.400 protocol and X.400 connectors to connect to Exchange 5.5 Servers or other third-party X.400 mail systems.是什么意思_This section focuses on using the X.400 protocol and X.400 connectors to connect to Exchange 5.5 Servers or other third-party X.400 mail systems.在线翻译_英语_读音_用法_例句