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

$135.45

31
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$135.29

39
 2
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$197.43

28
8/10
1 user review
3
OEMEnglish64-bit 

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

Operating system

$136.85

22
 4
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$193.30

44
8/10
1 user review
5
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $141.55

16
4/10
6 user reviews
6
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$167.92

25
 7
RetailEnglish32/64-bit81

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$109.10

18
 8
OEMEnglish32-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$129.00

22
5/10
2 user reviews
9
UpgradeEnglish32/64-bit 

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

Operating system

$193.79

27
 10
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$138.98

28
 11
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$199.46

22
7/10
2 user reviews
12
OEMEnglish32-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$139.39

31
 13
OEMEnglish32-bit 

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

Operating system

$139.44

21
 14
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$284.07

28
 15
RetailEnglish32/64-bit 

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

Operating system

$527.85

15
 16
OEMEnglish64-bit 

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

Operating system

$134.99

25
 17
OEMEnglish64-bit 

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

Operating system

$355.25

20
 18
OEMEnglish64-bit 

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

Operating system

$1,003.94

12
 19
OEMEnglish64-bit 

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

Operating system

$263.35

20
 20
OEMEnglish64-bit 

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

Operating system

$200.10

26
 21
OEMEnglish32-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.00

14
 22
OEMEnglish 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

11
7/10
1 user review
23
OEMEnglish64-bit 

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 Server 2012 1 Device CAL Eng (OEM)

Operating system

$43.88

14
 25
OEMEnglish 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$520.95

12
 26
OEMEnglish64-bit 

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

Operating system

$959.10

11
 27
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,025.80

10
  28
RetailEnglish64-bit 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$4,940.40

8
 29
OEMEnglish64-bit 

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

Operating system

$5,004.80

8
 30
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,373.10

8
 31
English 

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

Operating system

$355.35

18
 32
OEMEnglish64-bit 

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

Operating system

$515.20

8
 33
English64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

4
 34
UpgradeEnglish32/64-bit 

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

Operating system

$3,134.90

10
 35
OEMEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

10
  36
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$204.25

21
4/10
4 user reviews
37
OEMEnglish64-bit 

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

Operating system

$77.05

11
 38
OEMEnglish64-bit 

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

Operating system

$1,087.25

1
  39
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 40
RetailEnglish 

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

Operating system

$447.35

19
 41
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$946.45

14
 42
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$182.85

12
 43
OEMEnglish 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$205.85

15
 44
OEMEnglish 

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

Operating system

$7,791.25

1
 45
RetailEnglish64-bit 

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

Operating system

$6,406.65

8
  46
OEMEnglish64-bit 

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

Operating system

$93.85

17
 47
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$179.40

34
 48
OEMEnglish32-bit 

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

Operating system

$2,595.55

7
  49
English64-bit 

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

Operating system

$945.25

19
 50
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 51
RetailEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$169.80

26
 52
OEMEnglish32-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 53
OEMEnglish 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 54
RetailEnglish 

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

Operating system

$94.30

12
 55
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$446.20

2
 7/10
1 user review
56
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,577.80

7
 57
English 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$397.90

8
 58
English 

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

Operating system

$75.70

17
 59
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 60
RetailEnglish 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 61
RetailEnglish64-bit 

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

Operating system

* $120.35

1
 6/10
1 user review
62
OEMEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 63
RetailEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 64
RetailEnglish64-bit 

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  65
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

* $370.13

2
  66
RetailEnglish32/64-bit82

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  67
UpgradeEnglish32/64-bit 

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

Operating system

$12,766.15

8
  68
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 69
RetailEnglish 

Microsoft Windows 7 Professional Eng

Operating system

* $525.84

2
 8/10
1 user review
70
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$205.00

  71
UpgradeEnglish32/64-bit 

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

Operating system

$279.90

5
  72
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  73
OEMEnglish32-bit 

Microsoft Windows Server 2008 5 User CALs Eng (OEM)

Operating system

$431.66

1
 74
OEMEnglish 

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

Operating system

$447.35

11
 75
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 Device CALs Eng

Operating system

$2,921.00

1
 76
RetailEnglish 

Microsoft Windows 7 Professional Eng (Upgrade)

Operating system

$388.70

3
 77
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Ultimate Eng

Operating system

* $608.35

1
 6/10
2 user reviews
78
RetailEnglish32/64-bit81

Microsoft Windows Server 2012 5 Device CALs Eng

Operating system

$346.15

8
 79
English 

Microsoft Windows 7 Home Premium Eng (Upgrade fr Starter)

Operating system

$98.97

1
 80
UpgradeEnglish32/64-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  81
OEMEnglish32-bit 

Microsoft Windows Server 2003 5 User CALs Eng (OEM)

Operating system

$431.66

1
 82
OEMEnglish 

Microsoft Windows Server 2003 5 Device CALs Eng (OEM)

Operating system

$472.14

1
 83
OEMEnglish 

Microsoft Windows XP Professional x64 SP2c Eng (OEM)

Operating system

$498.77

1
 84
OEMEnglish64-bit 

Microsoft Windows Server 2008 Standard Eng (OEM)

Operating system

$1,584.45

1
  85
OEMEnglish32/64-bit 

Microsoft Windows Home Server Eng (OEM)

Operating system

$255.55

1
 9/10
9 user reviews
86
OEMEnglish32-bit83

Microsoft Windows Server 2003 Standard x64 Eng (OEM)

Operating system

$1,615.11

1
  87
OEMEnglish64-bit 

Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)

Operating system

$1,052.89

1
  88
OEMEnglish32-bit1

Microsoft Windows SBS 2011 Premium 20 Device CALs Eng

Operating system

$3,696.10

1
 89
RetailEnglish 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng

Operating system

$924.60

1
 90
RetailEnglish 

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

Operating system

$1,913.60

8
  91
OEMEnglish64-bit 

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

Operating system

$2,250.55

7
 92
English64-bit 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

2
  93
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$217.35

1
 6/10
1 user review
94
OEMEnglish64-bit 

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

Operating system

$159.85

1
  95
OEMEnglish32-bit1

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

Operating system

$217.35

1
  96
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  97
MUI 

Microsoft Windows 8 Professional Eng (Academic Upgrade ESD)

Operating system

$89.99

1
  98
Student upgrade E-license (ESD)English 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  99
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional Eng (ESD)

Operating system

$349.00

1
  100
English 

Microsoft Windows 8 Eng (ESD)

Operating system

$199.00

1
  101
English 

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

Operating system

$11,873.75

1
 102
English64-bit 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  103
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  104
Electronic software distribution (ESD)English 
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