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

40
 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 8.1 Professional Eng (64-bit OEM)

Operating system

$194.25

42
8/10
1 user review
4
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$209.00

20
8/10
1 user review
5
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$167.76

29
 6
RetailEnglish32/64-bit81

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

Operating system

$143.11

19
 7
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$139.59

27
 8
UpgradeEnglish32/64-bit 

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

Operating system

$143.11

24
7/10
1 user review
9
OEMEnglish64-bit 

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

Operating system

$191.99

30
7/10
1 user review
10
OEMEnglish64-bit 

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

Operating system

$146.00

15
 11
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$283.15

28
 12
RetailEnglish32/64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $139.00

8
4/10
6 user reviews
13
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$143.75

28
 14
OEMEnglish32-bit 

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

Operating system

$272.41

18
 15
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

3
 16
UpgradeEnglish32/64-bit 

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

Operating system

$208.27

26
 17
OEMEnglish32-bit 

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

Operating system

$547.79

19
 18
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$199.00

10
4/10
4 user reviews
19
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

17
 20
OEMEnglish 

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

Operating system

$366.72

18
 21
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

8
7/10
1 user review
22
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

* $151.64

8
 23
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$199.53

32
 24
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$204.15

16
7/10
2 user reviews
25
OEMEnglish32-bit 

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

Operating system

$525.92

8
 26
English64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$566.00

11
 27
OEMEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

2
  28
UpgradeEnglish32/64-bit 

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

Operating system

$1,006.95

21
 29
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$221.72

18
 30
OEMEnglish 

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

Operating system

$2,421.90

1
8/10
1 user review
31
RetailEnglish64-bit 

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

Operating system

$1,020.71

13
 32
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,028.88

11
 33
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$41.29

14
 34
OEMEnglish 

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

Operating system

$77.25

17
 35
OEMEnglish64-bit 

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

Operating system

$1,023.52

12
 36
OEMEnglish64-bit 

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

Operating system

$7,791.25

1
 37
RetailEnglish64-bit 

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

Operating system

$11,873.75

1
 38
English64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 39
RetailEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 40
RetailEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,041.62

9
  41
RetailEnglish64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 42
OEMEnglish 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 43
RetailEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$163.94

6
 44
OEMEnglish32-bit 

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

Operating system

$3,411.00

10
 45
OEMEnglish64-bit 

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

Operating system

$2,273.55

7
  46
English64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 47
RetailEnglish64-bit 

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

Operating system

$6,715.43

8
  48
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$146.05

4
5/10
2 user reviews
49
UpgradeEnglish32/64-bit 

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

Operating system

$13,391.98

8
  50
OEMEnglish64-bit 

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

Operating system

$79.18

11
 51
OEMEnglish64-bit 

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

Operating system

$5,996.10

8
 52
OEMEnglish64-bit 

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

Operating system

$2,616.25

7
  53
English64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,600.80

7
  54
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,396.10

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

$466.00

12
 58
OEMEnglish64-bit 

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

Operating system

$375.00

13
 59
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$194.72

13
 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

$405.10

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 SBS 2011 Premium 5 Device CALs Eng (OEM)

Operating system

$466.00

11
 74
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 Device CALs Eng

Operating system

$2,921.00

1
 75
RetailEnglish 

Microsoft Windows 7 Professional Eng (Upgrade)

Operating system

$388.70

2
  76
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Ultimate Eng

Operating system

* $608.35

1
 6/10
2 user reviews
77
RetailEnglish32/64-bit81

Microsoft Windows Server 2012 5 Device CALs Eng

Operating system

$351.80

8
 78
English 

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

Operating system

$2,044.93

8
  86
OEMEnglish64-bit 

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

$217.35

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 Vista Business SP1 Eng (32-bit OEM)

Operating system

$217.35

1
  90
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  91
MUI 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  92
Electronic software distribution (ESD)English 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  93
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  94
Electronic software distribution (ESD)English 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  95
OEMEnglish32-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  96
OEMEnglish32-bit 
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