If you’ll notice, BizTalk Operations Guide was released to public.

Check these links:

http://download.microsoft.com/download/a/a/d/aad035e6-e03b-4bea-ad9a-fa1ff8d10ca0/BTS06R2_OpReadiness.docx
http://download.microsoft.com/download/a/a/d/aad035e6-e03b-4bea-ad9a-fa1ff8d10ca0/BTS06R2_OpReadiness.exe
http://download.microsoft.com/download/a/a/d/aad035e6-e03b-4bea-ad9a-fa1ff8d10ca0/BTS06R2_OpReadiness.pdf

The .exe file contains compressed HTM help file (.chm), which is quite useful for TOC and search features.