Actually, it's not just because of Windows 8. It's just that it turns out we don't need netbooks anymore.
Since the rollout of the release code for Windows 8 on MSDN and Technet last week, we've been updating all our test machines with various versions of the latest Windows.
It's gone on desktop PCs with multiple monitors, on various laptops, on hybrid touch and pen tablet PCs, and on a selection of slate form-factor PCs.
One set of devices it's not been anywhere near is the netbooks that have been sitting around the office for the past couple of years. After all, they were at the heart of much of our Windows 7 testing, and Microsoft had done a lot of work in making it run well on low-power and small form-factor devices.
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Windows 8: It's goodbye netbooks, hello tablets | ZDNet