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Surface RT, 2012
The snappily titled Surface with Windows 8 RT (mostly known as the Surface RT) is the first device to arrive as part of Microsoft's most recent attempt to build its own tablet hardware. Running the slimmed down Windows 8 RT operating system, it's aimed at consumers, coming in at the same price as the iPad.
Because it runs on ARM chips, the Windows 8 RT operating system can't run normal desktop apps — only ones downloaded from the Microsoft Store.
Reviews have varied, though it has won some admirers. But perhaps not enough; Microsoft seems to have massively overestimated demand for this model – leading to a $900m write-down to cover the cost of unsold inventory.
Surface Pro, 2013
The Surface with Windows 8 Pro is the first business version of Microsoft's tablet. Running the full version of Windows 8, its high spec and higher ultrabook-style price means it is aimed firmly at the enterprise market. Our reviewer liked the build quality and the performance but said it was let down by battery life.
The Surface 2 arrived a year after the first model, and features a dual-position kickstand that angles the display at either 24 degrees or 40 degrees. While our reviewer liked the bump in performance over the Surface RT, the lack of apps remained a sticking point.