Over 100 million individuals have purchased Windows 8 licenses from Microsoft in roughly six months.

Tami Reller, co-head of Microsoft's Windows division, told Reuters an OS update is due by the end of the year, code-named Windows Blue. "We've considered a lot of different scenarios to help traditional PC users move forward as well as making usability that much better on all devices," she said. One thing the update will do is make Windows 8 more friendly to smaller tablets, such as seven and eight-inch models.

Reller couldn't say exactly what would be in the update, nor could she confirm if Microsoft would manufacturer a smaller version of its Surface tablet. In the first quarter of 2013, Microsoft has sold 900,000 Surface tablets, compared to 19.5 million iPads and 8.8 million Samsung tablets.

This article was originally published on Joystiq.

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