We aren't comparing it to the total number of PCs in the world and that marketshare relevance. I am sure there aren't particularly accurate statistics for that

We aren't comparing it to the total number of PCs in the world and that marketshare relevance. I am sure there aren't particularly accurate statistics for that usage anyway. This is a comparison between Linux on ARM and Windows on ARM. Not against Windows vs Linux as a whole. I assume this is in the context of future consumer desktop platforms on ARM hardware. In that context, OEMs who want to release a functional desktop product with ARM chips would find it a lot easier/appealing with ARM than on Windows at present. In that context, Linux on ARM is vastly ahead of Windows of ARM. My argument is that the total number of raspberry pis being used a Linux ARM desktop outstrips the amount of Windows ARM desktops (which are composed of surface RT/X tablets).