iMac runs Windows in Mac Pro production line.
In the launch of iOS 8 and OS X 10.10 a few days ago, Apple emphasized the figures that Windows computers are slumping in market share and sales while Mac computers do the opposite. However, there is a fact that Tim Cook and Apple's CEO have accidentally acknowledged. Many specialized software is currently only run on computers using Microsoft's rival operating system.
The image he shared on Twitter during a visit to the Mac Pro computer production line in Austin, Texas, USA showed that the iMac machine is running Windows operating system. Similar images have appeared but are in Foxconn and this is Apple's own factory and is producing Apple devices.
Apple began testing some of the US production lines, typically high-end Mac Pro computers. Other popular products like the iPhone and iPad are mostly through the original device manufacturer Foxconn, Apple's longtime partner. The transfer of production to the US helped Apple better manage product security and production lines. Labor costs in the US may be higher but in return there will be no loss of shipping from China to the current headquarters.