Let me try to understand what happened. For some obscure searches that return no results normally, a handful of users searched on Google using IE's toolbar and then clicked on bogus results.

Those bogus results made it to Bing's results eventually.

Ok... So it proves Microsoft analyzes the toolbar behavior and when it has no other data, it will therefore look like a copy of Google search.

Sounds fair to me. Do you want to get into a discussion on how exactly Google tracks you online?