Also, I think this is slowly becoming less of an issue. A substantial number (10-15% of global PC market share, depending who you ask) of users have made the jump to Mac, which is quite different from Windows. And on top of that, many now use iPads or Android tablets, with even newer UI paradigms.

When you combine this with much of your data now being available through cloud services, the barrier for trying something like Linux should become lower.

5% share for Ubuntu would be significant. Compare that to 2.9% for iPad, and it could mean a lot better application support. The current desktop Linux share is about half of iPad's: http://en.wikipedia.org/wiki/Usage_share_of_operating_system...