WARNING: This is not a perfect process. Local formatting, Quark applied styling, runarounds etc., and some features/effects of later versions, like drop shadows, may not carry over to the new InDesign file and may need to be recreated.
NOTE: Multiple layouts (not multiple pages) in a single file count as multiple files and need to be paid for accordingly, or split to multiple files by you.
If your file is in Quark 10, please save it back to version 9, if possible, before sending.
If you have other Quark or Indesign work, let me know and maybe I can help.