Re: Windows is no longer a necessity...
Unfortunately, this is not true. Not for most business users anyway. Believe me, I would love to live to see Windows rot and die, but there are too many proprietary Windows applications out there for this to happen for a while.
I have several CAD/CAM applications that aren't easily replaceable on Linux or the MAC. I wish they were (and, yes before suggesting "xyz woks on linux...", I have done extensive research looking for a suitable replacement).
In scientific fields, they use proprietary software for running various instruments, the same with medical fields. Engineering also uses tons of specialized Windows applications.
I'm the last person that wants to run Windows, but I can't make the switch yet, much to my complete disgust! Many others are in the same boat.