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 8.1 Eng (64-bit OEM)

Operating system

$139.00

39
 1
OEMEnglish64-bit 

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

Operating system

$142.60

25
7/10
1 user review
2
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$208.05

20
8/10
1 user review
3
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$194.25

42
8/10
1 user review
4
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$158.95

30
 5
RetailEnglish32/64-bit81

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

Operating system

$146.00

17
 6
OEMEnglish32-bit 

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

Operating system

$191.99

34
7/10
1 user review
7
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $141.55

8
4/10
6 user reviews
8
OEMEnglish64-bit 

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

Operating system

$143.11

28
7/10
1 user review
9
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$139.59

28
 10
UpgradeEnglish32/64-bit 

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

Operating system

$145.55

14
 11
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$204.15

16
7/10
2 user reviews
12
OEMEnglish32-bit 

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

Operating system

$271.48

20
 13
OEMEnglish64-bit 

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

Operating system

$207.13

27
 14
OEMEnglish32-bit 

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

Operating system

$547.79

21
 15
OEMEnglish64-bit 

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

Operating system

$371.25

19
 16
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$303.60

6
7/10
1 user review
17
OEMEnglish64-bit 

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

Operating system

$998.73

23
 18
OEMEnglish64-bit 

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

Operating system

$522.10

9
 19
English64-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$282.88

29
 20
RetailEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

$89.95

3
 21
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$129.38

9
 22
OEMEnglish32-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

17
 23
OEMEnglish 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,028.88

7
  25
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$42.69

15
 26
OEMEnglish 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$143.75

30
 27
OEMEnglish32-bit 

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

Operating system

$3,411.00

10
 28
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 29
RetailEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

2
  30
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 31
OEMEnglish 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$198.55

10
4/10
4 user reviews
32
OEMEnglish64-bit 

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

Operating system

$2,616.25

7
  33
English64-bit 

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

Operating system

$2,044.93

7
  34
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$220.47

19
 35
OEMEnglish 

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

Operating system

$80.90

12
 36
OEMEnglish64-bit 

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

Operating system

$1,023.52

12
 37
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$198.44

29
 38
OEMEnglish32-bit 

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

Operating system

$1,020.71

15
 39
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$566.00

12
 40
OEMEnglish64-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
41
RetailEnglish64-bit 

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

Operating system

$7,791.25

1
 42
RetailEnglish64-bit 

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

Operating system

$11,873.75

1
 43
English64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 44
RetailEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,041.62

9
  45
RetailEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 46
RetailEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

* $194.35

5
 47
OEMEnglish32-bit 

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

Operating system

$2,273.55

7
  48
English64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 49
RetailEnglish64-bit 

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

Operating system

$6,715.43

8
  50
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$146.05

4
5/10
2 user reviews
51
UpgradeEnglish32/64-bit 

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

Operating system

$13,391.98

7
  52
OEMEnglish64-bit 

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

Operating system

$81.25

11
 53
OEMEnglish64-bit 

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

Operating system

$5,996.10

8
 54
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,600.80

7
  55
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,396.10

9
 56
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,050.15

8
 57
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 58
RetailEnglish 

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

Operating system

$466.00

12
 59
OEMEnglish64-bit 

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

Operating system

$375.00

13
 60
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$199.53

14
 61
OEMEnglish 

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

Operating system

$100.92

12
 62
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 63
RetailEnglish 

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

Operating system

$100.92

11
 64
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
65
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$404.80

9
 66
English 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 67
RetailEnglish 

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

$298.02

1
  74
OEMEnglish32-bit 

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

Operating system

$466.00

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

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

$353.05

9
 79
English 

Microsoft Windows 7 Home Premium Eng (Upgrade fr Starter)

Operating system

$98.97

1
 80
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2008 Standard Eng (OEM)

Operating system

$1,584.45

1
  81
OEMEnglish32/64-bit 

Microsoft Windows Home Server Eng (OEM)

Operating system

$255.55

1
 9/10
9 user reviews
82
OEMEnglish32-bit83

Microsoft Windows Server 2003 Standard x64 Eng (OEM)

Operating system

$1,615.11

1
  83
OEMEnglish64-bit 

Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)

Operating system

$1,052.89

1
  84
OEMEnglish32-bit1

Microsoft Windows SBS 2011 Premium 20 Device CALs Eng

Operating system

$3,696.10

1
 85
RetailEnglish 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng

Operating system

$924.60

1
 86
RetailEnglish 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  87
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$228.85

1
 6/10
1 user review
88
OEMEnglish64-bit 

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

Operating system

$159.85

1
  89
OEMEnglish32-bit1

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  90
MUI 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  91
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  92
Electronic software distribution (ESD)English 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  93
OEMEnglish32-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  94
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  95
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional MUI (Upgrade fr Standard ESD)

Operating system

$397.90

1
 96
MUI 
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