M box 2; From PC to Mac

[Johanbuhl]

Hey
I thinking about buying an iMac, and I have a couple of questions.
I have an M box 2 with pro tools 7 running on win xp sp2.
1. Can I use my M box 2 USB audio interface bought for a PC, with an iMac?
2. Do I need too buy a new pro tools 7 edition to run on mac, or is it free to download once you have already bought this version for a PC
3. And finally, do I have to upgrade my pro tools 7 to pro tools 8, to run it on the new mac OS?

Hope someone can help me with this, thx.

Johan