BizTalk MsgBoxViewer - download here the latest version of the tool
UPDATE :
MBV is deprecated. and is now replaced by BizTalk Health Monitor (aka BHM)
BHM is a complete MMC Snap-in reusing the same health check engine and architecture than MBV, but its query/rule repository is updated frequently to detect all recent BizTalk issues.
BHM can be included in the BizTalk console, provides a rich UI, is fully customizable, and embed a new version of famous Terminator tool as remediation component.
See the BHM blog for all info on this powerfull BizTalk Health Check application :
Download here BHM :
https://www.microsoft.com/en-us/download/details.aspx?id=43716
Feel feel to let your feedbacks or post your questions on the BHM blog
JP