I recently learned about the “View installed updates” link in Add/Remove programs.  It reveals the updates and BizTalk Cumulative Updates installed on your system.  Below are screen shots from Win 2008/R2.

BizTalk_Installed_Updates_CumulativeUpdatePack1_AddRemovePrograms

Results – just scroll down and look for updates related to Microsoft BizTalk.  The Adapter Pack CU3 was temporarily uninstalled due an issue we are working on with Microsoft.  The following shows we are on CU5 (for the BizTalk Core product), and that CU6 is not installed.

BizTalk_Installed_Updates_CumulativeUpdatePack2