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

43
 1
OEMEnglish64-bit 

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

Operating system

$141.95

26
7/10
1 user review
2
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$194.25

45
8/10
1 user review
3
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$148.35

30
 4
RetailEnglish32/64-bit81

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$211.60

22
8/10
1 user review
5
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $144.53

8
4/10
6 user reviews
6
OEMEnglish64-bit 

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

Operating system

$191.99

33
7/10
1 user review
7
OEMEnglish64-bit 

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

Operating system

$139.15

29
7/10
1 user review
8
OEMEnglish64-bit 

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

Operating system

$146.00

15
 9
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$204.15

18
7/10
2 user reviews
10
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$136.85

28
 11
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$129.38

9
 12
OEMEnglish32-bit 

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

Operating system

$983.25

22
 13
OEMEnglish64-bit 

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

Operating system

$371.25

18
 14
OEMEnglish64-bit 

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

Operating system

$275.52

18
 15
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

$68.95

3
 16
UpgradeEnglish32/64-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$278.30

26
 17
RetailEnglish32/64-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$303.60

5
7/10
1 user review
18
OEMEnglish64-bit 

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

Operating system

$523.25

20
 19
OEMEnglish64-bit 

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

Operating system

$551.95

8
 20
English64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$223.12

17
 21
OEMEnglish 

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

Operating system

$145.55

6
  22
OEMEnglish32-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

16
 23
OEMEnglish 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$143.75

32
 24
OEMEnglish32-bit 

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

Operating system

$203.55

27
 25
OEMEnglish32-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$202.73

10
4/10
4 user reviews
26
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$198.02

28
 27
OEMEnglish32-bit 

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

Operating system

$6,715.43

7
  29
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$527.05

11
 30
OEMEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 31
RetailEnglish64-bit 

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

Operating system

$2,670.27

6
  32
English64-bit 

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

Operating system

$2,139.86

6
  33
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,626.30

6
  34
English 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$408.24

8
 35
English 

Microsoft Windows Server 2012 5 Device CALs Eng

Operating system

$354.99

8
 36
English 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

* $194.35

5
 37
OEMEnglish32-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$43.88

13
 38
OEMEnglish 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,069.00

5
  39
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 40
OEMEnglish 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

1
  41
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 42
RetailEnglish64-bit 

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

Operating system

$3,492.78

2
 43
OEMEnglish64-bit 

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

Operating system

$81.25

11
 44
OEMEnglish64-bit 

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

Operating system

$1,015.00

7
  45
OEMEnglish64-bit 

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

Operating system

$1,051.95

14
 46
OEMEnglish64-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
47
RetailEnglish64-bit 

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

Operating system

$7,791.25

1
 48
RetailEnglish64-bit 

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

Operating system

$11,873.75

1
 49
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 50
RetailEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,054.00

8
  51
RetailEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 52
RetailEnglish32/64-bit 

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

Operating system

$2,318.65

6
  53
English64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$146.05

3
5/10
2 user reviews
54
UpgradeEnglish32/64-bit 

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

Operating system

$13,391.98

6
  55
OEMEnglish64-bit 

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

Operating system

$81.25

10
 56
OEMEnglish64-bit 

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

Operating system

$5,996.10

7
 57
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,415.32

8
 58
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,714.10

6
  59
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 60
RetailEnglish 

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

Operating system

$467.00

11
 61
OEMEnglish64-bit 

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

Operating system

$376.00

12
 62
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$199.53

13
 63
OEMEnglish 

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

Operating system

$100.92

11
 64
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 65
RetailEnglish 

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

Operating system

$100.92

10
 66
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
67
UpgradeEnglish32/64-bit 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 68
RetailEnglish 

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  69
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

* $370.13

2
  70
RetailEnglish32/64-bit82

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  71
UpgradeEnglish32/64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 72
RetailEnglish 

Microsoft Windows 7 Professional Eng

Operating system

* $525.84

2
 8/10
1 user review
73
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$205.00

  74
UpgradeEnglish32/64-bit 

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

Operating system

$467.00

10
 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 7 Home Premium Eng (Upgrade fr Starter)

Operating system

$98.97

1
 79
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2008 Standard Eng (OEM)

Operating system

$1,584.45

1
  80
OEMEnglish32/64-bit 

Microsoft Windows Home Server Eng (OEM)

Operating system

$255.55

1
 9/10
9 user reviews
81
OEMEnglish32-bit83

Microsoft Windows Server 2003 Standard x64 Eng (OEM)

Operating system

$1,615.11

1
  82
OEMEnglish64-bit 

Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)

Operating system

$1,052.89

1
  83
OEMEnglish32-bit1

Microsoft Windows SBS 2011 Premium 20 Device CALs Eng

Operating system

$3,696.10

1
 84
RetailEnglish 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng

Operating system

$924.60

1
 85
RetailEnglish 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  86
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$228.85

1
 6/10
1 user review
87
OEMEnglish64-bit 

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

Operating system

$159.85

1
  88
OEMEnglish32-bit1

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  89
MUI 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  90
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  91
Electronic software distribution (ESD)English 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  92
OEMEnglish32-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  93
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  94
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional MUI (Upgrade fr Standard ESD)

Operating system

$397.90

1
 95
MUI 

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

Operating system

$298.02

1
  96
OEMEnglish32-bit 
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