It peaked at 4.05% in March. The last 2 months it went just below 4% as the Unknown category increased. For June the reverse happened, so 4.04% seems to be the real current share of Linux on Desktop as desktop clients were read properly/werent spoofed.
Next:
Must always be online
Cost is now $9.99 per month (free with commercial breaks. For now of course.)
Everything is stored online (60GB free, $5.99/month to up it to 199GB, $49/m for 400GB).