According to the winedb, as of wine 0.9.57, iTunes works ok under wine, store services included. I haven't tested it myself, since I am not a fan of iTunes.
http://appdb.winehq.org/objectManager.php?sClass=version&iId=10543 -- Jesús Guerrero <[EMAIL PROTECTED]> -- gentoo-user@lists.gentoo.org mailing list
