Quark to InDesign Translator

Does anyone know if there's an InDesign plug-in or extension that allows you to open Quark files? We're thinking of making the switch to InDesign, but could use your help on this. Thanks!

Quark 4 only

Hi there,
As per my understanding, you can only open Quark 4 files into InDesign so you would have to save your Quark 6 files down to 5 then open in 5 and save down to 4 and then open in InDesign. I think InDesign did this to push people to make the decision to switch to InDesign as opposed to buying Quark 5 or 6. Hope this helps!