One lofty estimate for ultrabook sales was recently cut in half due to underwhelming results thus far. The launch of Windows 8, and the impending holiday season will probably create a spike in ultrabook sales, but overall the demand simply doesn't seem to match expectations.
For Windows 8, it seems like a better alternative would be a tablet. The tablet is designed to be used as a touchscreen device, and is suited to take advantage of the unique features of Windows 8.
Many vendors are offering hybrid solutions--Windows 8 tablets with a physical keyboard docking station that turns it into a convertible tablet / ultrabook mashup. If the price is right, a tablet hybrid could be a better platform for Windows 8, a more versatile mobile device for users, and deliver better bang for the buck than a Windows 8 ultrabook.
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