The operating system can be described as a set of software responsible for managing a computer's hardware. The most common are Windows and Mac OS.
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Product Lowest price User rating Rank Type of license Language CPU support

Microsoft Windows 7 Home Premium Eng (64-bit OEM)

Operating system

$133.00

29
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$132.90

36
 2
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$191.80

41
8/10
1 user review
3
OEMEnglish64-bit 

Microsoft Windows 7 Home Premium Eng (32-bit OEM)

Operating system

$136.40

21
 4
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$197.00

23
8/10
1 user review
5
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$166.91

27
 6
RetailEnglish32/64-bit81

Microsoft Windows 7 Home Premium SP1 Eng (64-bit OEM)

Operating system

$132.91

24
 7
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $141.55

12
4/10
6 user reviews
8
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$282.06

28
 9
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional SP1 Eng (64-bit OEM)

Operating system

$191.99

27
 10
OEMEnglish64-bit 

Microsoft Windows Server 2012 R2 Essentials 2 CPU Eng (64-bit OEM)

Operating system

$533.77

16
 11
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$137.14

26
 12
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 R2 Standard 2 CPU Eng (64-bit OEM)

Operating system

$945.25

19
 13
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$109.10

16
 14
OEMEnglish32-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$129.00

15
5/10
2 user reviews
15
UpgradeEnglish32/64-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$125.01

31
 16
OEMEnglish32-bit 

Microsoft Windows 7 Home Premium SP1 Eng (32-bit OEM)

Operating system

$140.96

20
 17
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$199.30

18
7/10
2 user reviews
18
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate SP1 Eng (64-bit OEM)

Operating system

$265.25

20
 19
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$204.25

20
4/10
4 user reviews
20
OEMEnglish64-bit 

Microsoft Windows 7 Professional SP1 Eng (32-bit OEM)

Operating system

$197.13

25
 21
OEMEnglish32-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.00

13
 23
OEMEnglish 

Microsoft Windows Server 2008 R2 Standard Eng (64-bit)

Operating system

$2,421.90

1
8/10
1 user review
24
RetailEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

9
7/10
1 user review
25
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 5 User CALs Eng (OEM)

Operating system

$355.25

20
 26
OEMEnglish64-bit 

Microsoft Windows Server 2012 R2 Essentials 2 CPU Eng (64-bit)

Operating system

$523.37

8
 27
English64-bit 

Microsoft Windows Server 2012 R2 Standard 5 CALs Eng (64-bit)

Operating system

$2,273.99

7
 28
English64-bit 

Microsoft Windows Server 2012 R2 Datacenter 4 CPU Eng (64-bit OEM)

Operating system

$12,781.10

8
  29
OEMEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 30
RetailEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$529.26

12
 31
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 1 User CAL Eng (OEM)

Operating system

$76.26

17
 32
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

3
 33
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

7
  34
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,041.62

9
  35
RetailEnglish64-bit 

Microsoft Windows Server 2012 Datacenter 2 Add. CPU Eng (OEM)

Operating system

$5,025.50

8
 36
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$43.88

14
 37
OEMEnglish 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 38
RetailEnglish64-bit 

Microsoft Windows SBS 2011 Standard 1 Device CAL Eng (OEM)

Operating system

$76.99

11
 39
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 Add. CPU Eng (OEM)

Operating system

$973.59

8
  40
OEMEnglish64-bit 

Microsoft Windows Server 2008 R2 Enterprise SP1 Eng (64-bit OEM)

Operating system

$3,155.60

10
 41
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 10 CALs Eng (64-bit)

Operating system

$2,616.25

7
  42
English64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$196.83

28
 43
OEMEnglish32-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$169.80

19
 44
OEMEnglish32-bit 

Microsoft Windows Server 2008 Standard R2 SP1 Eng (64-bit OEM)

Operating system

$1,087.25

1
  45
OEMEnglish64-bit 

Microsoft Windows Server 2008 R2 Standard SP1 5 CALs Eng (64-bit OEM)

Operating system

$1,001.52

12
 46
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,598.78

7
 47
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,390.59

8
 48
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$4,961.10

8
 49
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$960.69

13
 50
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 51
RetailEnglish 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng (OEM)

Operating system

$453.82

13
 52
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng (OEM)

Operating system

$357.77

13
 53
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$183.60

12
 54
OEMEnglish 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$207.29

16
 55
OEMEnglish 

Microsoft Windows Server 2008 R2 Enterprise Eng (64-bit)

Operating system

$7,791.25

1
 56
RetailEnglish64-bit 

Microsoft Windows Server 2012 R2 Datacenter 2 CPU Eng (64-bit OEM)

Operating system

$6,421.60

8
  57
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 1 User CAL Eng (OEM)

Operating system

$94.76

12
 58
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 59
RetailEnglish32/64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 60
OEMEnglish 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 61
RetailEnglish 

Microsoft Windows SBS 2011 Premium 1 Device CAL Eng (OEM)

Operating system

$94.76

11
 62
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
63
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$403.13

8
 64
English 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 65
RetailEnglish 

Microsoft Windows Home Server 2011 Eng (64-bit OEM)

Operating system

$102.35

 6/10
1 user review
66
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 67
RetailEnglish64-bit 

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  68
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

* $370.13

2
  69
RetailEnglish32/64-bit82

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  70
UpgradeEnglish32/64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 71
RetailEnglish 

Microsoft Windows 7 Professional Eng

Operating system

* $525.84

2
 8/10
1 user review
72
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$205.00

  73
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Ultimate SP1 Eng (32-bit OEM)

Operating system

$279.90

5
  74
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  75
OEMEnglish32-bit 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng (OEM)

Operating system

$453.82

11
 76
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 Device CALs Eng

Operating system

$2,921.00

1
 77
RetailEnglish 

Microsoft Windows 7 Professional Eng (Upgrade)

Operating system

$388.70

2
  78
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Ultimate Eng

Operating system

* $608.35

1
 6/10
2 user reviews
79
RetailEnglish32/64-bit81

Microsoft Windows Server 2012 5 Device CALs Eng

Operating system

$348.38

8
 80
English 

Microsoft Windows 7 Home Premium Eng (Upgrade fr Starter)

Operating system

$98.97

1
 81
UpgradeEnglish32/64-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  82
OEMEnglish32-bit 

Microsoft Windows Server 2008 Standard Eng (OEM)

Operating system

$1,584.45

1
  83
OEMEnglish32/64-bit 

Microsoft Windows Home Server Eng (OEM)

Operating system

$255.55

1
 9/10
9 user reviews
84
OEMEnglish32-bit83

Microsoft Windows Server 2003 Standard x64 Eng (OEM)

Operating system

$1,615.11

1
  85
OEMEnglish64-bit 

Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)

Operating system

$1,052.89

1
  86
OEMEnglish32-bit1

Microsoft Windows SBS 2011 Premium 20 Device CALs Eng

Operating system

$3,696.10

1
 87
RetailEnglish 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng

Operating system

$924.60

1
 88
RetailEnglish 

Microsoft Windows Server 2012 R2 Standard 4 CPU Eng (64-bit OEM)

Operating system

$1,932.66

8
  89
OEMEnglish64-bit 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  90
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$217.35

1
 6/10
1 user review
91
OEMEnglish64-bit 

Microsoft Windows Vista Home Premium Eng (32-bit OEM)

Operating system

$159.85

1
  92
OEMEnglish32-bit1

Microsoft Windows Vista Business SP1 Eng (32-bit OEM)

Operating system

$217.35

1
  93
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  94
MUI 

Microsoft Windows 8 Professional Eng (Academic Upgrade ESD)

Operating system

$89.99

1
  95
Student upgrade E-license (ESD)English 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  96
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional Eng (ESD)

Operating system

$349.00

1
  97
English 

Microsoft Windows 8 Eng (ESD)

Operating system

$199.00

1
  98
English 

Microsoft Windows Server 2008 R2 Datacenter 4 CPU (64-bit OEm)

Operating system

$11,873.75

1
 99
English64-bit 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  100
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  101
Electronic software distribution (ESD)English 
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