Apple does not support Windows 7 for Boot Camp on the new generation MacBook

According to the new Boot Camp tool documentation, Windows 7 will no longer be supported on MacBooks that Apple has released.
Information about unsupported operating system Windows 7 product key on the Boot Camp tool to run Windows on this Mac is just found in a MacRumors document in a guide here.
Users of new MacBook Pro and MacBook Air models sold this year will not be able to install Windows 7 home premium product key via Boot Camp.

However, applications running virtual machines on OS X like Parallels or WMWare can still install all Windows operating systems but can not get the most out of the hardware. Meanwhile, the Windows operating system running on Boot Camp is the operating system installed on a separate operating system separate from OS X should have better use.
Boot Camp on the new MacBook Pro and Air will only be able to install Windows 8 and newer operating systems like Microsoft's upcoming Windows 10. Earlier in 2013, Apple also stopped supporting Windows 7 on its Mac Pro line. Of course, this has caused Mac Pro users are angry because many people believe that Windows 7 professional product key operating system offers a more comfortable use than Windows 8.
At the recent "Spring Forward" event, Apple has upgraded its MacBook Air and MacBook Pro lineup to a more powerful graphics engine thanks to the HD Graphics 6000 GPU, higher performance and better battery life. New Intel Broadwell Processor.