Which operating system is most used in offices work and personal system?

Windows XP service pack3 with Internet explore8 is more better than other OS

I Think was XP actualy till now and from last to years its Windows7 

• Windows7 and windows xp are now most common official operating system

Windows XP Service Pack3 is most using OS for office

And Windows8 for personal computer or laptop

Windows7

Win XP &&& Win7

Windows XP and Windows7 are most commonly used operating system in office now a days......But window XP update will stop in2014.So it is better to migrate to windows7 as soon as possible.

windows7 

Windows XP & Windows7

I think this depends on the region where the office found, in the middle east microsoft windows7 and XP have the majority, but for example in America i think the IOS (Mac PC) have a great percentage and may be the major there,

and regarding the personal computers OS it also depends on the region and i think in the middle east windows7 has the majority.

As a matter of fact, the operating system is most used in offices work and personal system is Microsoft operating systems:

1998 till2000 Windows98 and windows98 SE.

2000 till2002 Windows98 SE and windows2000 professional

2002 till2008 Windows XP professional

2009 till2014 Windows XP professional and windows7

 I think the future for Windows8.1 and successors