Just in case you don't have these in your RSS aggregator of choice, here are the links to the MS Knowledge Base feeds for both BizTalk and Commerce Server ...
- BizTalk KB feed - https://search.support.microsoft.com/common/rss.aspx?rssid=1444&ln=en-us
- Commerce Server KB feed - https://search.support.microsoft.com/common/rss.aspx?rssid=1552&ln=en-us
Killer way to get instant info on how-tos and fixes.