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

$133.00

27
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$132.90

36
 2
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$198.00

22
8/10
1 user review
3
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$192.00

40
8/10
1 user review
4
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$168.59

24
 5
RetailEnglish32/64-bit81

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$137.87

26
 6
UpgradeEnglish32/64-bit 

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

Operating system

$139.00

20
 7
OEMEnglish32-bit 

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

Operating system

$191.99

26
 8
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$109.10

15
 9
OEMEnglish32-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $140.00

10
4/10
6 user reviews
10
OEMEnglish64-bit 

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

Operating system

$132.99

24
 11
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$204.15

17
7/10
2 user reviews
12
OEMEnglish32-bit 

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

Operating system

$978.28

19
 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 Eng (64-bit OEM)

Operating system

$293.25

9
7/10
1 user review
15
OEMEnglish64-bit 

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

Operating system

$547.75

18
 16
OEMEnglish64-bit 

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

Operating system

$200.64

23
 17
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$283.15

25
 18
RetailEnglish32/64-bit 

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

Operating system

$519.79

8
 19
English64-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$125.01

29
 20
OEMEnglish32-bit 

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

Operating system

$141.23

19
 21
OEMEnglish32-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
22
RetailEnglish64-bit 

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

Operating system

$272.50

18
 23
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$42.78

13
 24
OEMEnglish 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$562.07

11
 25
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

10
 26
OEMEnglish 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$129.00

13
5/10
2 user reviews
28
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 29
RetailEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

4
 30
UpgradeEnglish32/64-bit 

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

Operating system

$3,292.00

10
 31
OEMEnglish64-bit 

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

Operating system

$1,022.68

12
 32
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$207.25

19
4/10
4 user reviews
33
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$152.24

18
 34
OEMEnglish32-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 35
OEMEnglish 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,039.58

9
  36
RetailEnglish64-bit 

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

Operating system

$13,391.98

8
  37
OEMEnglish64-bit 

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

Operating system

$2,267.80

7
 38
English64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$225.15

15
 39
OEMEnglish 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,019.00

9
  40
OEMEnglish64-bit 

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

Operating system

$77.26

16
 41
OEMEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 42
RetailEnglish64-bit 

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

Operating system

$78.03

11
 43
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 44
RetailEnglish64-bit 

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

Operating system

$5,996.10

8
 45
OEMEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

5
  46
UpgradeEnglish32/64-bit 

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

Operating system

$1,019.00

8
  47
OEMEnglish64-bit 

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

Operating system

$2,610.50

7
  48
English64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$194.96

28
 49
OEMEnglish32-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,595.05

7
  50
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,390.35

8
 51
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,050.15

8
 52
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 53
RetailEnglish 

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

Operating system

$468.10

13
 54
OEMEnglish64-bit 

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

Operating system

$373.53

13
 55
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$195.67

12
 56
OEMEnglish 

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

Operating system

$7,791.25

1
 57
RetailEnglish64-bit 

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

Operating system

$6,715.43

8
  58
OEMEnglish64-bit 

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

Operating system

$96.54

12
 59
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 60
RetailEnglish 

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

Operating system

$96.54

11
 61
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
62
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$401.17

8
 63
English 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 64
RetailEnglish 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 65
RetailEnglish64-bit 

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 SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 69
RetailEnglish 

Microsoft Windows 7 Professional Eng

Operating system

* $525.84

2
 8/10
1 user review
70
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$205.00

  71
UpgradeEnglish32/64-bit 

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

Operating system

$279.90

5
  72
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  73
OEMEnglish32-bit 

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

Operating system

$468.10

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

$350.09

8
 78
English 

Microsoft Windows 7 Home Premium Eng (Upgrade fr Starter)

Operating system

$98.97

1
 79
UpgradeEnglish32/64-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  80
OEMEnglish32-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 Server 2012 R2 Standard 4 CPU Eng (64-bit OEM)

Operating system

$2,039.18

8
  87
OEMEnglish64-bit 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  88
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$217.35

1
 6/10
1 user review
89
OEMEnglish64-bit 

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

Operating system

$159.85

1
  90
OEMEnglish32-bit1

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

Operating system

$217.35

1
  91
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  92
MUI 

Microsoft Windows 8 Professional Eng (Academic Upgrade ESD)

Operating system

$89.99

1
  93
Student upgrade E-license (ESD)English 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  94
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional Eng (ESD)

Operating system

$349.00

1
  95
English 

Microsoft Windows 8 Eng (ESD)

Operating system

$199.00

1
  96
English 

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

Operating system

$11,873.75

1
 97
English64-bit 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  98
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  99
Electronic software distribution (ESD)English 
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