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Operating system can be opensource even
Hello, most popular is Microsoft windows for office and it is user friendly.
Well in many cases the Clinet Machine you are using for day to day activities at your home or at office Microsoft Windows with all variety of versions are avaliable.
If your talking about the Server side. You will have 2 choices wherather Microsoft Server or Unix Based Server.
Hi, Microsoft windos desktop -Win 7 win 10 most popular enterprise and in window server 2003 ,win 2012 R2.
PC: Windows7, Windows8, Windows Server2008 R2, or Windows Server2012Mac: Mac OS X10.6 or later
Agree to Feras's answer . Adding lil more details , coming April2014 there won't be any support for Windows XP , so it would be mandate to upgrade to Windows7. And I think majority, presently it's divided between Windows XP and7 . Servers I think Windows2008 R2(IIS) and Linux(Apache) , where Linux would have much more share as (PHP,PERL, J2EE,MySQL) would be used more than (.NET,SQL Server).
In Software QA , they would be having all O/S to test websites , apps.
Ubuntu by far is the OS of choice.