We've updated the core documentation again!
Microsoft BizTalk Server 2006 Documentation Update (CHM)
https://www.microsoft.com/downloads/details.aspx?FamilyId=3294DDAF-9F67-409F-A92D-2F6070DC0D1A&displaylang=en
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Microsoft BizTalk Server 2006 Documentation Update (CHM)
https://www.microsoft.com/downloads/details.aspx?FamilyId=3294DDAF-9F67-409F-A92D-2F6070DC0D1A&displaylang=en