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

29
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$132.90

35
 2
OEMEnglish64-bit 

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

Operating system

$139.00

20
 3
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$191.80

39
8/10
1 user review
4
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$197.00

23
8/10
1 user review
5
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$166.77

25
 6
RetailEnglish32/64-bit81

Microsoft Windows 8.1 Professional Eng

Operating system

$283.15

27
 7
RetailEnglish32/64-bit 

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

Operating system

$132.91

24
 8
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $143.75

12
4/10
6 user reviews
9
OEMEnglish64-bit 

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

Operating system

$945.25

18
 10
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$109.10

15
 11
OEMEnglish32-bit 

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

Operating system

$191.83

27
 12
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$139.60

26
 13
UpgradeEnglish32/64-bit 

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

Operating system

$526.50

17
 14
OEMEnglish64-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$198.23

18
7/10
2 user reviews
15
OEMEnglish32-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$125.01

29
 16
OEMEnglish32-bit 

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

Operating system

$200.25

24
 17
OEMEnglish32-bit 

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

Operating system

$525.92

8
 19
English64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$565.34

12
 20
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$129.00

14
5/10
2 user reviews
21
UpgradeEnglish32/64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$204.25

19
4/10
4 user reviews
22
OEMEnglish64-bit 

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

Operating system

$355.25

20
 23
OEMEnglish64-bit 

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

Operating system

$140.62

20
 24
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

9
7/10
1 user review
25
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$42.78

14
 26
OEMEnglish 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

10
  27
OEMEnglish 

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

Operating system

$77.26

17
 28
OEMEnglish64-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
29
RetailEnglish64-bit 

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

Operating system

$272.41

16
 30
OEMEnglish64-bit 

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

Operating system

$2,271.25

7
 31
English64-bit 

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

Operating system

$13,391.98

8
  32
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

3
 33
UpgradeEnglish32/64-bit 

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

Operating system

$999.27

12
 34
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,044.20

9
  35
RetailEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 36
RetailEnglish64-bit 

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

Operating system

$5,996.10

8
 37
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 38
RetailEnglish64-bit 

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

Operating system

$78.03

11
 39
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,031.71

12
 40
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 41
OEMEnglish 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

6
  42
UpgradeEnglish32/64-bit 

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

Operating system

$1,019.00

8
  43
OEMEnglish64-bit 

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

Operating system

$3,292.00

10
 44
OEMEnglish64-bit 

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

Operating system

$2,613.95

7
  45
English64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$194.57

29
 46
OEMEnglish32-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$169.80

19
 47
OEMEnglish32-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,598.50

7
 48
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,393.80

8
 49
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,050.15

8
 50
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 51
RetailEnglish 

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

Operating system

$456.03

13
 52
OEMEnglish64-bit 

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

Operating system

$364.78

13
 53
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$194.72

12
 54
OEMEnglish 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$224.04

15
 55
OEMEnglish 

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

Operating system

$7,791.25

1
 56
RetailEnglish64-bit 

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

Operating system

$6,715.43

8
  57
OEMEnglish64-bit 

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

Operating system

$96.54

12
 58
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 59
RetailEnglish32/64-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

$405.10

8
 63
English 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 64
RetailEnglish 

Microsoft Windows Home Server 2011 Eng (64-bit OEM)

Operating system

$102.35

 6/10
1 user review
65
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 66
RetailEnglish64-bit 

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

$279.90

5
  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

$456.03

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

$348.38

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

$2,042.63

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 Professional Eng (Academic Upgrade ESD)

Operating system

$89.99

1
  94
Student upgrade E-license (ESD)English 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  95
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional Eng (ESD)

Operating system

$349.00

1
  96
English 

Microsoft Windows 8 Eng (ESD)

Operating system

$199.00

1
  97
English 

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

Operating system

$11,873.75

1
 98
English64-bit 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  99
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  100
Electronic software distribution (ESD)English 
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