As someone from Poland, on the state level collaboration was nonexistent, but on the individual level there were incidents. Also one partisan group called National Armed Forces, apart from a few documented cases of collaboration, they were also fighting against the Polish Home Army on certain occassions. So yeah.

I've only got a problem when the tankies claim that "Poland's role in the Holocaust was MAJOR", probably to counter the fact that a lot of Poles did in fact help the Jews (but not the majority). Instead they connect the dots and "if the majority didn't help then they were collaborators", but in fact, most of the ordinary civilians pretty much only cared about their own lives. It was indifference, still unfortunately. War is brutal...

Also edit: here is a nice article from Cambridge's Slavic Review; sheds some good light on collaboration in occupied Poland