BizTalk 2006 R2 ships with support for WSS 3.0/MOSS 2007 (the R1 only supports WSS2.0/SPS 2003). In the Installation Wizard of BizTalk there is an option (unchecked by default) to install the Windows SharePoint Services adapter. With this adapter, BizTalk can communicate with WSS.
I saw many times now that the checkbox for this adapter is grayed out. If that's the case, let wizard doesn't let you install it.
Possible causes:
- You don't have a running WSS 2.0/3.0 configuration;
- Language difference. If you install the English BizTalk version, make sure you run the OS and WSS of the same language. And don't have a language template pack installed
- Security issue. I had this one. I installed WSS and promoted the machine after it to a domain controller with dcpromo.exe.
Now I have it finally installed. I installed Win2003 x64 R2 SP-2, SQL 2005 x64 SP-2, WSS 3.0 SP-1 (slipstreamed version) and BizTalk Developer Edition 2006 R2.
Hope this helps,