There are 2 different Microsoft – WebSphere MQ adapters. The one that comes on the BizTalk 2006/9 cd has a COM+ based component that needs to be installed. The other one which is referred to as MQSC is on a different installation disk. You will find it on the BizTalk Adapters for Host Systems installation disk.
If you have a BizTalk license you are also licensed for this adapter even if it is on a different disk. We are using it in a similar situation as you Windows 2008 – MQ v 7 with fix pack 7.0.1