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1 | 
Routing | 
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Consider how message routing affects server efficiency. Modify routing by assigning costs to each connection, or by setting a schedule for desired connection times. | 
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2 | 
Site Connector | 
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Deliver a message to any server in a remote site by using the Site Connector. | 
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3 | 
X.400 Connector | 
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Connect Microsoft Exchange Server sites across slower network connections and private or public packet networks. Also, connect to foreign systems by using X.400 services. | 
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4 | 
Internet Mail Service | 
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Use the Internet Mail Service to exchange information with foreign systems that use the Simple Mail Transfer Protocol (SMTP). | 
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5 | 
Microsoft Mail Connector for PC Networks | 
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Connect Microsoft Exchange Server and one or more MS Mail (PC) systems by using the Microsoft Mail Connector. | 
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6 | 
Microsoft Mail Connector for AppleTalk Networks | 
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Connect Microsoft Exchange Server and one or more Microsoft Mail for AppleTalk Networks (also known as Quarterdeck Mail) systems by using the Microsoft Mail Connector. | 
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7 | 
Microsoft Exchange Connector for Lotus cc:Mail | 
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Connect Microsoft Exchange Server and one or more Lotus cc:Mail systems by using the Connector for cc:Mail. |