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Surface RT, 2012
The snappily titled Surface with Windows 8 RT (mostly known as the Surface RT) is 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.
Surface Pro, 2013
The Surface with Windows 8 Pro is the business version of Microsoft's tablet, due to go on sale at the end of this month. Running the full version of Windows 8, its high spec and higher ultrabook-style price means it is aimed firmly at the enterprise market. Will it win hearts and minds? And, after more than a decade of trying, will Microsoft crack the tablet market?