http://wiki.siemens-enterprise.com/wiki/OpenScape_Office_with_Microsoft_Exchange_Server

OpenScape Office supports groupware features like:

• Calendar Integration
• Public Folder Contacts search
• Send mails from OpenScape Office LX/MX to Microsoft Exchange Server

These features require a link between OpenScape Office server and a Microsoft Exchange Server.

The documents, which are provided here, contain the appropriate settings within MS Exchange and OpenScape Office. Due to historical reasons the document content itself does not mention all OpenScape Office versions. Therefore the documents are grouped below to the OpenScape Office version for which they are valid   

Details: http://wiki.siemens-enterprise.com/wiki/OpenScape_Office_with_Microsoft_Exchange_Server