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The lightning-exchange-provider addon allows you to use MicrosoftExchange calendars in Thunderbird, via Exchange’s web services. The addon works on Thunderbird 3.
MicrosoftExchange compatible server and client libraries
OpenChange is a portable Open Source implementation of MicrosoftExchange server and Exchange protocols. It provides a complete solution to interoperate with Microsoft Outlook clients or MicrosoftExchange servers.
OpenChange client-side library is used in existing messaging clients and is the solution in new projects to communicate natively with MicrosoftExchange and Exchange-compatible servers.
A Java library to handle the MicrosoftExchange object (Contact, Calendar entries, tasks) in an easy way. Build on top of Slide (using Exhange WebDAV client)
The library can be used for Java CRM / planning/ PIM software to integrate with Exchange.