Acer said it was now unlikely to distribute the product before April.
Windows RT appears similar to the full Windows 8 system and is designed to run on ARM-based processors.
Unlike Windows 8, Microsoft only allows Windows RT to install third-party software from its own online store, and the apps can only run via the system's touch interface and not in the traditional desktop mode.
However, in return for this trade-off Windows RT computers are likely to offer longer battery life and cheaper prices."
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