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

$155.00

9
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 10 Home Eng (64-bit OEM)

Operating system

$176.77

20
 2
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$143.00

40
 3
OEMEnglish64-bit 

Microsoft Windows 10 Home Eng

Operating system

$159.85

18
 4
RetailEnglish32/64-bit 

Microsoft Windows 10 Pro Eng (64-bit OEM)

Operating system

$249.98

22
 5
OEMEnglish64-bit 

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

Operating system

$208.00

30
7/10
1 user review
6
OEMEnglish64-bit 

Microsoft Windows 10 Pro Eng

Operating system

$272.55

18
 7
RetailEnglish32/64-bit 

Microsoft Windows 8.1 Pro Eng (64-bit OEM)

Operating system

$199.95

41
7/10
2 user reviews
8
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$211.60

19
8/10
1 user review
9
OEMEnglish64-bit 

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

Operating system

$149.01

9
 10
OEMEnglish32-bit 

Microsoft Windows 8.1 Eng

Operating system

$164.47

26
 11
RetailEnglish32/64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

$145.00

8
4/10
6 user reviews
12
OEMEnglish64-bit 

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

Operating system

$147.00

7
 7/10
1 user review
13
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$164.29

22
 14
OEMEnglish32-bit 

Microsoft Windows 8.1 Pro Pack Eng (Upgrade fr Standard)

Operating system

$136.85

24
 15
UpgradeEnglish32/64-bit 

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

Operating system

$378.89

19
 16
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$298.71

2
 7/10
1 user review
17
OEMEnglish64-bit 

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

Operating system

$520.95

8
 18
English64-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$205.85

14
7/10
2 user reviews
19
OEMEnglish32-bit 

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

Operating system

$1,007.61

20
 20
OEMEnglish64-bit 

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

Operating system

$1,039.93

12
 21
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$43.13

15
 22
OEMEnglish 

Microsoft Windows 10 Pro Eng (32-bit OEM)

Operating system

$248.61

14
 23
OEMEnglish32-bit 

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

Operating system

* $308.58

3
 24
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 25
RetailEnglish64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$244.32

18
 26
OEMEnglish 

Microsoft Windows 8.1 Pro Eng (32-bit OEM)

Operating system

$218.63

16
 27
OEMEnglish32-bit 

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

Operating system

$5,996.10

7
 28
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$155.00

8
 29
OEMEnglish32-bit 

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

Operating system

$606.86

15
 30
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$211.77

16
 31
OEMEnglish 

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

Operating system

$97.75

12
  32
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 33
RetailEnglish32/64-bit 

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

Operating system

$487.77

12
  34
OEMEnglish64-bit 

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

Operating system

$487.77

11
 35
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 36
RetailEnglish 

Microsoft Windows 10 Home Eng (32-bit OEM)

Operating system

$189.95

3
  37
OEMEnglish32-bit 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 38
RetailEnglish 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 39
RetailEnglish64-bit 

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

Operating system

$212.65

25
 40
OEMEnglish32-bit 

Microsoft Windows 8.1 Pro Eng

Operating system

* $278.00

19
 41
RetailEnglish32/64-bit 

Microsoft Windows 8 Pro Eng (64-bit OEM)

Operating system

$219.00

8
4/10
4 user reviews
42
OEMEnglish64-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
43
RetailEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,041.62

9
  44
RetailEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

1
  45
UpgradeEnglish32/64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

1
 46
RetailEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 Device CALs Eng

Operating system

$2,921.00

1
 47
RetailEnglish 

Microsoft Windows SBS 2011 Premium 20 Device CALs Eng

Operating system

$3,696.10

1
 48
RetailEnglish 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$51.78

19
 49
OEMEnglish 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$624.85

5
  50
OEMEnglish64-bit 

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

Operating system

$81.25

10
  51
OEMEnglish64-bit 

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

Operating system

$6,715.43

8
  53
OEMEnglish64-bit 

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

Operating system

$3,492.78

2
 54
OEMEnglish64-bit 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,714.10

6
  55
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 56
RetailEnglish 

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

Operating system

$169.63

4
  57
OEMEnglish32-bit 

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

Operating system

$83.95

11
  58
OEMEnglish64-bit 

Microsoft Windows 8 Pro Eng (32-bit OEM)

Operating system

$194.35

3
 59
OEMEnglish32-bit 

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

Operating system

$1,085.03

5
  60
OEMEnglish64-bit 

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

Operating system

$97.75

11
 61
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 62
OEMEnglish 

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

Operating system

$2,626.31

7
  63
English64-bit 

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

Operating system

$2,139.86

8
  64
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 65
RetailEnglish 

Microsoft Windows 8 Pro Pack Eng (Upgrade fr Standard)

Operating system

$135.70

3
 66
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$397.56

7
  67
English 

Microsoft Windows Server 2012 5 Device CALs Eng

Operating system

$345.71

7
  68
English 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,590.24

7
  69
English 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,130.39

1
  70
OEMEnglish64-bit 

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

Operating system

$7,791.25

1
 71
RetailEnglish64-bit 

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

Operating system

$11,873.75

1
 72
OEMEnglish64-bit 

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

Operating system

$2,278.47

8
 73
English64-bit 

Microsoft Windows 8 Pro Eng (Upgrade)

Operating system

* $169.00

1
 5/10
2 user reviews
74
UpgradeEnglish32/64-bit 

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

Operating system

$13,391.98

8
  75
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,382.81

7
  76
English 

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

Operating system

$388.99

12
  77
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
78
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  79
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

$370.13

2
  80
RetailEnglish32/64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  81
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Professional Eng

Operating system

$525.84

2
 8/10
1 user review
82
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$220.50

  83
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade)

Operating system

$388.70

2
  84
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Ultimate Eng

Operating system

$608.35

1
 6/10
2 user reviews
85
RetailEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng (Upgrade fr Starter)

Operating system

$154.20

  86
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2008 Standard Eng (OEM)

Operating system

$1,584.45

1
  87
OEMEnglish32/64-bit 

Microsoft Windows Home Server Eng (OEM)

Operating system

$255.55

1
 9/10
9 user reviews
88
OEMEnglish32-bit 

Microsoft Windows Server 2003 Standard x64 Eng (OEM)

Operating system

$1,615.11

1
  89
OEMEnglish64-bit 

Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)

Operating system

$1,052.89

1
  90
OEMEnglish32-bit 

Microsoft Windows SBS 2011 Premium 5 Device CALs Eng

Operating system

$924.60

1
 91
RetailEnglish 

Microsoft Windows Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  92
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$228.85

1
 6/10
1 user review
93
OEMEnglish64-bit 

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

Operating system

$159.85

1
  94
OEMEnglish32-bit 

Microsoft Windows 8.1 Pro Pack MUI (Upgrade fr Standard)

Operating system

$169.00

1
  95
UpgradeMUI 

Microsoft Windows 8.1 Pro Eng (Student ESD)

Operating system

$89.99

1
  96
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  97
Electronic software distribution (ESD)English 

Microsoft Windows 8.1 Pro Eng (ESD)

Operating system

$349.00

1
  98
Electronic software distribution (ESD)English 

Microsoft Windows 8 Pro Pack MUI (Upgrade fr Standard ESD)

Operating system

$397.90

1
 99
Upgrade electronic software distribution (ESD)MUI 

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

Operating system

$298.02

1
  100
OEMEnglish32-bit 

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

Operating system

$1,114.75

2
  101
OEMEnglish64-bit 
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