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

$134.81

27
7/10
1 user review
2
OEMEnglish64-bit 

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

Operating system

$149.01

21
 3
OEMEnglish32-bit 

Microsoft Windows 8.1 Eng

Operating system

$169.45

24
 4
RetailEnglish32/64-bit81

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$198.00

22
8/10
1 user review
6
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$192.95

41
8/10
1 user review
7
OEMEnglish64-bit 

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

Operating system

$132.99

25
 8
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

* $149.00

8
4/10
6 user reviews
9
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$134.00

29
 10
OEMEnglish32-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$199.00

17
7/10
2 user reviews
11
OEMEnglish32-bit 

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

Operating system

$191.99

27
 12
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$113.85

9
 13
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$139.60

26
 14
UpgradeEnglish32/64-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$283.15

25
 15
RetailEnglish32/64-bit 

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

Operating system

$144.31

20
 16
OEMEnglish32-bit 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$293.25

9
7/10
1 user review
17
OEMEnglish64-bit 

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

Operating system

$3,292.00

10
 18
OEMEnglish64-bit 

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

Operating system

$529.00

8
 19
English64-bit 

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

Operating system

$1,012.91

20
 20
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$207.25

18
4/10
4 user reviews
21
OEMEnglish64-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

12
 22
OEMEnglish 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

* $99.00

4
 23
UpgradeEnglish32/64-bit 

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

Operating system

$547.75

18
 24
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 25
OEMEnglish 

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

Operating system

$271.91

18
 26
OEMEnglish64-bit 

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

Operating system

$371.25

13
 27
OEMEnglish64-bit 

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

Operating system

$2,421.90

1
8/10
1 user review
28
RetailEnglish64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$43.88

13
 29
OEMEnglish 

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

Operating system

$208.51

24
 30
OEMEnglish32-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$163.94

14
 31
OEMEnglish32-bit 

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

Operating system

$2,266.65

7
 32
English64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$129.00

7
5/10
2 user reviews
33
UpgradeEnglish32/64-bit 

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

Operating system

$1,024.16

14
 34
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$569.00

11
 35
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 36
RetailEnglish64-bit 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

2
 37
RetailEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

3
  38
UpgradeEnglish32/64-bit 

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

Operating system

$6,715.43

8
  39
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$207.33

28
 40
OEMEnglish32-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 41
RetailEnglish32/64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,040.75

9
  42
RetailEnglish64-bit 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$221.21

16
 43
OEMEnglish 

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

Operating system

$13,391.98

8
  44
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,028.26

9
  45
OEMEnglish64-bit 

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

Operating system

$77.26

16
 46
OEMEnglish64-bit 

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

Operating system

$80.33

11
 47
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 48
RetailEnglish64-bit 

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

Operating system

$5,996.10

8
 49
OEMEnglish64-bit 

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

Operating system

$1,019.00

8
  50
OEMEnglish64-bit 

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

Operating system

$2,612.80

7
  51
English64-bit 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,593.90

7
  52
English 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,386.90

8
 53
English 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,050.15

8
 54
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 55
RetailEnglish 

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

Operating system

$469.00

13
 56
OEMEnglish64-bit 

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

Operating system

$377.00

13
 57
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$200.45

12
 58
OEMEnglish 

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

Operating system

$7,791.25

1
 59
RetailEnglish64-bit 

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

Operating system

$98.84

12
 60
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 61
RetailEnglish 

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

Operating system

$98.84

11
 62
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
63
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$408.24

8
 64
English 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 65
RetailEnglish 

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

3
  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

$469.00

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

$354.99

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

$2,038.03

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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