This figure outlines the details of the Oracle Collaboration Coexistence Gateway architecture. The diagram is divided vertically into three sections. On the left, is the Microsoft Exchange domain, in the center is the Internet/Intranet, and on the right is the Oracle Beehive domain. Within the Microsoft Exchange domain, there is a cylinder representing Microsoft Exchange. Four folders are attached to the cylinder representing the user mailbox, public free/busy, MTS-OUT, and MTS-IN. To the right of the cylinder and folders, there are three squares representing different Oracle Collaboration Coexistence Gateway services. The squares are labeled: Oracle Change Notification Server, Oracle Communication Service, and Oracle Connector for Exchange. Within the Internet/Intranet section, there is a cloud. The cloud is labeled HTTP/HTTPS. Within the Oracle Beehive domain, there is a cylinder representing Oracle Beehive. A square is overlaid on the cylinder, representing the Oracle Beehive Coexistence service. Two arrows are pointing from the HTTP/HTTPS cloud. One points to the Oracle Beehive Coexistence Service, the other to the Oracle Communication Service. A bidirectional arrow points to the Oracle Communication Service from the Oracle Connector for Exchange. Three arrows point out from the Oracle Connector for Exchange service. The first points to the MTS-IN folder, the second to the public free/busy folder, and the third to the user mailbox. An arrow points from the user mailbox to the Oracle Change Notification Service for Exchange. An arrow points from the Oracle Change Notification Service for Exchange to the MTS-OUT folder. Finally, an arrow points from the MTS-OUT folder to Oracle Connector for Exchange.