A Unified Communications Managed API (UCMA) application is an application designed to run in an Office Communications Server (OCS) environment. A UCMA application can access various OCS features, such as collaboration, speech, or the communications workflow.
http://msdn.microsoft.com/en-us/library/dd266409(office.13).aspx
Microsoft Office Communications Server 2007 R2 delivers streamlined communications to help you find and communicate with the right person, in real time, from the applications you use most.
The Microsoft Office Communications Server 2007 R2 Software Development Kit (SDK) includes documentation and sample applications developed with the Office Communications Server 2007 R2 platform.
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