Thank you both for your fast replies. I'm gonna wait some weeks more because Meego seems to have problem with wifi on wind (everything else is okay, even bluetooth, I tested it yesterday) and this problem should be corrected soon following the bug reports.
Still, I have some question about the way you share a folder between two different system. If I understood good, if it's a separate partition that is not home folder, it's not protected at all, because all systems can access to it by mounting it. Is that true or not?
But if I make it /home folder, it should be protected, but this way I have to take the same user name (and password I suppose?) in both system and change permissions.
Is that okay or did I miss something? Is there a way to protect a partition that's not home?
Sorry for the nooby questions