Over 12 percent of all US homes have at least one Mac but aren't exclusive to the platform, the NPD Group found in its latest Household Penetration study. The number is a large jump from nine percent just last year, but about 85 percent of these also have at least one Windows PC as well. These homes are also more likely to have three or more computers, at 66 percent, versus just 29 percent for Windows-only homes.
