I just changed the Strophe connection of chapter 10 to point to my local Openfire and I keep getting the "Collaboration not supported with ". Is it possible to use openfire with the example or are there other steps I have to do with configuring openfire to get it to work?

It should work. What URL are you using for your bosh connection? It should be something like:

http://localhost:7070/http-bind/

Note that the final slash is important in Openfire.

I am having the same issue. I believe the problem is that Openfire doesn't have required feature "http://metajack.im/ns/netpad" - how we could possibly get that? Would .WAR file of the simple plugin be possible to get?