If you read this article, on Page 15 it says that the Server Adapter is inbuilt into BizTalk 2010 and the Client adapter is included in HIS 2010.
http://www.microsoft.com/…/info.aspx
BizTalk Adapter for WebSphere MQ
Another option for integrating IBM WebSphere MQ infrastructure with new solutions based on Microsoft server applications is the set of Microsoft BizTalk Adapters for WebSphere MQ.
Microsoft BizTalk Server 2010 includes a built-in adapter that uses IBM WebSphere MQ Server for Windows.
Additionally, HIS 2010 includes a Microsoft BizTalk Adapter for WebSphere MQ that uses IBM WebSphere MQ Client for Windows.