Apparently Microsoft was expecting Windows 8 sales to be much higher than they have been to date. No doubt this is at least partly because of doubts related to the new user interface, and partly due to general satisfaction with Windows 7, acknowledged to be the basis for Windows 8.

Update: Ars Technica looks at the available numbers and says it’s too soon to declare Windows 8 a disaster.

Update 2: The Verge reports that Microsoft is claiming they have sold 40 million Windows 8 upgrades in its first month.