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

$132.90

38
 1
OEMEnglish64-bit 

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

Operating system

$134.16

26
7/10
1 user review
2
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$198.00

22
8/10
1 user review
4
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$192.95

39
8/10
1 user review
5
OEMEnglish64-bit 

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

Operating system

$132.99

23
 6
OEMEnglish64-bit 

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

Operating system

$149.01

16
 7
OEMEnglish32-bit 

Microsoft Windows 8.1 Eng

Operating system

$163.21

26
 8
RetailEnglish32/64-bit81

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

Operating system

$191.99

26
 9
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$136.76

25
 10
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $149.00

8
4/10
6 user reviews
11
OEMEnglish64-bit 

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

Operating system

$139.15

18
 12
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$278.21

26
 13
RetailEnglish32/64-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$134.00

27
 14
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$204.15

16
7/10
2 user reviews
15
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

9
7/10
1 user review
16
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

3
 17
UpgradeEnglish32/64-bit 

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

Operating system

$523.37

8
 18
English64-bit 

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

Operating system

$523.25

18
 19
OEMEnglish64-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
20
RetailEnglish64-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

13
 21
OEMEnglish 

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

Operating system

$983.16

20
 22
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

* $151.64

8
 23
OEMEnglish32-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

3
  24
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$209.00

10
4/10
4 user reviews
25
OEMEnglish64-bit 

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

Operating system

$271.93

16
 26
OEMEnglish64-bit 

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

Operating system

$201.25

23
 27
OEMEnglish32-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 28
OEMEnglish 

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

Operating system

$366.49

18
 29
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$175.95

6
 30
OEMEnglish32-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$565.94

11
 31
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 32
RetailEnglish32/64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,037.30

9
  33
RetailEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 34
RetailEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 35
RetailEnglish64-bit 

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

Operating system

$7,791.25

1
 36
RetailEnglish64-bit 

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

Operating system

$11,873.75

1
 37
English64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$221.19

17
 38
OEMEnglish 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$42.78

13
 39
OEMEnglish 

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

Operating system

$3,308.00

10
 40
OEMEnglish64-bit 

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

Operating system

$1,020.71

14
 41
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$201.16

29
 42
OEMEnglish32-bit 

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

Operating system

$2,265.50

7
  43
English64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 44
RetailEnglish64-bit 

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

Operating system

$6,715.43

8
  45
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$146.05

5
5/10
2 user reviews
46
UpgradeEnglish32/64-bit 

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

Operating system

$13,391.98

8
  47
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,024.81

9
  48
OEMEnglish64-bit 

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

Operating system

$77.26

16
 49
OEMEnglish64-bit 

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

Operating system

$78.03

11
 50
OEMEnglish64-bit 

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

Operating system

$5,996.10

8
 51
OEMEnglish64-bit 

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

Operating system

$1,019.56

11
 52
OEMEnglish64-bit 

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

Operating system

$2,608.20

7
  53
English64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,592.75

7
  54
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,388.05

8
 55
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,050.15

8
 56
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 57
RetailEnglish 

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

Operating system

$469.00

12
 58
OEMEnglish64-bit 

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

Operating system

$375.36

12
 59
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$195.50

12
 60
OEMEnglish 

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

Operating system

$97.69

12
 61
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 62
RetailEnglish 

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

Operating system

$97.69

11
 63
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

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

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$403.13

8
 65
English 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 66
RetailEnglish 

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  67
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

* $370.13

2
  68
RetailEnglish32/64-bit82

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  69
UpgradeEnglish32/64-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

$298.02

1
  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

$469.00

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

$350.09

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-bit 

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
RetailEnglish 

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

Operating system

$2,036.88

8
  88
OEMEnglish64-bit 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  89
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$217.35

1
 6/10
1 user review
90
OEMEnglish64-bit 

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

Operating system

$159.85

1
  91
OEMEnglish32-bit1

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

Operating system

$217.35

1
  92
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  93
MUI 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  94
Electronic software distribution (ESD)English 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  95
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  96
Electronic software distribution (ESD)English 
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