You'd expect device manufacturers to find it a doddle to move from Linux to Windows (Android to Windows RT) but it looks as if things are not as simple as it seems.
We asked a tier-1 tablet and smartphone manufacturer whether it would be possible to swap Android Ice Cream Sandwich for example for Windows RT, the first (full fat) Windows On ARM iteration of Windows and we got a categorical "no, it is not possible" as an answer.
We were not provided with more details but it seems that failing a firmware update, users will not be able to individually swap operating systems the way desktop and laptop users do it.
In theory, all devices using the Nvidia Tegra 3 processor would be able to run Windows 8; these are the HTC One X, the ZTE Era, the LG Optimus 4X HD, The IdeaTab K2, the ZTE T98, the Toshiba AT270, the Acer Iconia A510/A700 and the Asus Transformer Prime Range.
In addition, all the aforementioned devices have a HD ready (or higher) resolution as well as 1GB RAM, which is enough to run Windows 8. It is however very likely that enthusiast DIYers will quickly find ways to run Windows RT on existing Android ICS tablets (assuming they lay their hands on an ODM install of Windows RT first).
But will Microsoft will be secretly happy if Windows RT managed to dislodge Android on a number of existing tablets, even if the copies are pirated? Why not?