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

$135.00

29
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$135.00

38
 2
OEMEnglish64-bit1

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$198.00

26
8/10
1 user review
3
OEMEnglish64-bit1

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$193.00

42
8/10
1 user review
4
OEMEnglish64-bit 

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

Operating system

$136.85

20
 5
OEMEnglish32-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $141.55

14
4/10
6 user reviews
6
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$169.41

20
 7
RetailEnglish32/64-bit81

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$109.10

16
 8
OEMEnglish32-bit1

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$138.68

27
 9
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$129.00

18
5/10
2 user reviews
10
UpgradeEnglish32/64-bit 

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

Operating system

$138.22

21
 11
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$199.15

19
7/10
2 user reviews
12
OEMEnglish32-bit 

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

Operating system

$193.00

28
 13
OEMEnglish64-bit1

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

Operating system

$134.99

26
 14
OEMEnglish64-bit1

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$138.22

29
 15
OEMEnglish32-bit1

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.00

14
 16
OEMEnglish 

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

Operating system

$261.76

21
 17
OEMEnglish64-bit 

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

Operating system

$197.46

25
 18
OEMEnglish32-bit1

Microsoft Windows 8.1 Professional Eng

Operating system

$284.14

26
 19
RetailEnglish32/64-bit 

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

Operating system

$533.72

17
 20
OEMEnglish64-bit1

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

Operating system

$979.71

13
 21
OEMEnglish64-bit 

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

Operating system

$355.25

20
 22
OEMEnglish64-bit 

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

Operating system

$968.82

12
 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 Essentials Eng (OEM)

Operating system

$526.68

13
 25
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$40.29

15
 26
OEMEnglish1

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

Operating system

$5,071.71

9
 27
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,387.87

8
 28
English 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

9
7/10
1 user review
29
OEMEnglish64-bit1

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,036.52

9
  30
RetailEnglish64-bit 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$5,006.34

9
 31
OEMEnglish64-bit 

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

Operating system

$356.91

18
 32
OEMEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

10
  33
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$204.25

20
4/10
4 user reviews
34
OEMEnglish64-bit1

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

Operating system

$74.60

12
 35
OEMEnglish64-bit 

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

Operating system

$1,087.25

1
  36
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 37
RetailEnglish 

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

Operating system

$447.86

19
 38
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$955.98

13
 39
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,595.64

7
 40
English 

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

Operating system

$520.81

8
 41
English64-bit1

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

Operating system

$3,173.76

11
 43
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

3
 44
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$183.60

13
 45
OEMEnglish1

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$207.29

16
 46
OEMEnglish 

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

Operating system

$7,791.25

1
 47
RetailEnglish64-bit 

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

Operating system

$6,438.85

9
  48
OEMEnglish64-bit 

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

Operating system

$92.66

18
 49
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$179.40

31
 50
OEMEnglish32-bit 

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

Operating system

$2,626.31

7
  51
English64-bit1

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

Operating system

$945.25

20
 52
OEMEnglish64-bit1

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 53
RetailEnglish32/64-bit1

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$169.80

22
 54
OEMEnglish32-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 55
OEMEnglish 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 56
RetailEnglish1

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

Operating system

$92.66

12
 57
OEMEnglish64-bit1

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$446.20

2
 7/10
1 user review
58
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$401.17

8
 59
English 

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

Operating system

$74.60

18
 60
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 61
RetailEnglish 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 62
RetailEnglish64-bit 

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

Operating system

$102.35

 6/10
1 user review
63
OEMEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 64
RetailEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 65
RetailEnglish64-bit1

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  66
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

* $370.13

2
  67
RetailEnglish32/64-bit82

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  68
UpgradeEnglish32/64-bit 

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

Operating system

$12,798.35

9
  69
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 70
RetailEnglish 

Microsoft Windows 7 Professional Eng

Operating system

* $525.84

2
 8/10
1 user review
71
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$205.00

  72
UpgradeEnglish32/64-bit 

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

Operating system

$261.76

6
  73
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  74
OEMEnglish32-bit 

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

Operating system

$447.86

12
 75
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 Device CALs Eng

Operating system

$2,921.00

1
 76
RetailEnglish1

Microsoft Windows 7 Professional Eng (Upgrade)

Operating system

$388.70

2
  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

$351.80

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 2008 Standard Eng (OEM)

Operating system

$1,584.45

1
  82
OEMEnglish32/64-bit1

Microsoft Windows Home Server Eng (OEM)

Operating system

$255.55

1
 9/10
9 user reviews
83
OEMEnglish32-bit83

Microsoft Windows Server 2003 Standard x64 Eng (OEM)

Operating system

$1,615.11

1
  84
OEMEnglish64-bit 

Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)

Operating system

$1,052.89

1
  85
OEMEnglish32-bit1

Microsoft Windows SBS 2011 Premium 20 Device CALs Eng

Operating system

$3,696.10

1
 86
RetailEnglish 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng

Operating system

$924.60

1
 87
RetailEnglish1

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

Operating system

$1,936.47

9
  88
OEMEnglish64-bit1

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

Operating system

$2,278.47

7
 89
English64-bit 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

2
  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
MUI1

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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