Look at the little sliver of black that represents Mac computer sales (looks like ~5m sales/quarter) and compare with the orange line that represents Windows computer sales (just under 80m sales/quarter).
Even if 100% of the Macs are laptops and only 10% (as a pessimistic guess) of the Windows machines are laptops, sales are still heavily in the Windows territory.
Look at the little sliver of black that represents Mac computer sales (looks like ~5m sales/quarter) and compare with the orange line that represents Windows computer sales (just under 80m sales/quarter).
Even if 100% of the Macs are laptops and only 10% (as a pessimistic guess) of the Windows machines are laptops, sales are still heavily in the Windows territory.