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

$142.00

22
7/10
1 user review
1
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng (64-bit OEM)

Operating system

$139.00

40
 2
OEMEnglish64-bit 

Microsoft Windows 8.1 Eng

Operating system

$159.80

31
 3
RetailEnglish32/64-bit81

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

Operating system

$204.00

32
7/10
1 user review
4
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (64-bit OEM)

Operating system

$201.00

45
8/10
1 user review
5
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)

Operating system

$138.17

31
 6
UpgradeEnglish32/64-bit 

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

Operating system

$147.00

21
7/10
1 user review
7
OEMEnglish64-bit 

Microsoft Windows 8 Eng (64-bit OEM)

Operating system

$149.00

8
4/10
6 user reviews
8
OEMEnglish64-bit 

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

Operating system

$551.95

8
 9
English64-bit 

Microsoft Windows 7 Professional Eng (64-bit OEM)

Operating system

$211.60

22
8/10
1 user review
10
OEMEnglish64-bit 

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

Operating system

$146.00

10
 11
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng

Operating system

$282.22

29
 12
RetailEnglish32/64-bit 

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

Operating system

$276.12

18
 13
OEMEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng (OEM)

Operating system

$199.53

14
 14
OEMEnglish 

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

Operating system

$1,006.62

22
 15
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng

Operating system

$1,054.00

8
  16
RetailEnglish64-bit 

Microsoft Windows 7 Professional Eng (32-bit OEM)

Operating system

$205.85

16
7/10
2 user reviews
17
OEMEnglish32-bit 

Microsoft Windows Server 2012 1 User CAL Eng (OEM)

Operating system

$46.55

20
 18
OEMEnglish 

Microsoft Windows Server 2012 5 User CALs Eng (OEM)

Operating system

$240.30

19
 19
OEMEnglish 

Microsoft Windows 7 Ultimate Eng (64-bit OEM)

Operating system

$298.71

5
7/10
1 user review
20
OEMEnglish64-bit 

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

Operating system

$371.25

19
 21
OEMEnglish64-bit 

Microsoft Windows 8 Eng (32-bit OEM)

Operating system

$155.00

8
 22
OEMEnglish32-bit 

Microsoft Windows 8.1 Eng (32-bit OEM)

Operating system

$143.75

24
 23
OEMEnglish32-bit 

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

Operating system

$169.00

4
  24
OEMEnglish32-bit 

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

Operating system

$556.23

20
 26
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 5 User CALs Eng

Operating system

$1,007.40

1
 27
RetailEnglish 

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

Operating system

$208.60

26
 28
OEMEnglish32-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 Server 2008 R2 Standard SP1 5 CALs Eng (64-bit OEM)

Operating system

$1,039.93

14
 30
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (64-bit OEM)

Operating system

$219.00

7
4/10
4 user reviews
31
OEMEnglish64-bit 

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

Operating system

$81.25

10
 32
OEMEnglish64-bit 

Microsoft Windows Server 2008 5 Device CALs Eng (OEM)

Operating system

$234.60

1
 33
OEMEnglish 

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

Operating system

$5,996.10

7
 34
OEMEnglish64-bit 

Microsoft Windows 8.1 Professional Eng (32-bit OEM)

Operating system

$216.32

24
 35
OEMEnglish32-bit 

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

Operating system

$100.92

10
 36
OEMEnglish64-bit 

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

Operating system

$1,076.00

7
  37
OEMEnglish64-bit 

Microsoft Windows Server 2012 Essentials Eng (OEM)

Operating system

$624.85

6
  38
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (32-bit OEM)

Operating system

$194.35

3
 39
OEMEnglish32-bit 

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

Operating system

$85.81

9
  40
OEMEnglish64-bit 

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

Operating system

$3,492.78

2
 41
OEMEnglish64-bit 

Microsoft Windows 8 Eng (Upgrade)

Operating system

$165.25

1
  42
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2008 5 User CALs Eng

Operating system

$456.55

1
 43
RetailEnglish32/64-bit 

Microsoft Windows Server 2012 1 Device CAL Eng (OEM)

Operating system

$42.69

13
 44
OEMEnglish 

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

Operating system

$2,661.41

6
  45
English64-bit 

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

Operating system

$2,139.86

6
  46
OEMEnglish64-bit 

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

Operating system

$6,715.43

7
  47
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium 20 User CALs Eng

Operating system

$3,696.10

1
 48
RetailEnglish 

Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)

Operating system

$6,714.10

6
  49
OEMEnglish64-bit 

Microsoft Windows 8 Professional Eng (Upgrade fr Standard)

Operating system

$135.70

2
 50
UpgradeEnglish32/64-bit 

Microsoft Windows Server 2012 5 User CALs Eng

Operating system

$397.56

8
 51
English 

Microsoft Windows Web Server 2008 R2 x64 Eng

Operating system

$1,017.75

1
 52
RetailEnglish64-bit 

Microsoft Windows Server 2012 5 Device CALs Eng

Operating system

$345.71

8
 53
English 

Microsoft Windows Server 2012 20 User CALs Eng

Operating system

$1,590.24

6
  54
English 

Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)

Operating system

$1,130.39

2
  55
OEMEnglish64-bit 

Microsoft Windows Server 2012 Standard 5 CALs Eng

Operating system

$2,440.30

1
 56
RetailEnglish64-bit 

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

Operating system

$7,791.25

1
 57
RetailEnglish64-bit 

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

Operating system

$11,873.75

1
 58
OEMEnglish64-bit 

Microsoft Windows SBS 2011 Premium Eng

Operating system

$3,236.10

1
 59
RetailEnglish64-bit 

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

Operating system

$2,309.80

6
 60
English64-bit 

Microsoft Windows 8 Professional Eng (Upgrade)

Operating system

$146.05

2
5/10
2 user reviews
61
UpgradeEnglish32/64-bit 

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

Operating system

$13,391.98

6
  62
OEMEnglish64-bit 

Microsoft Windows Server 2012 20 Device CALs Eng

Operating system

$1,382.81

8
 63
English 

Microsoft Windows SBS 2011 Standard 20 User CALs Eng

Operating system

$2,921.00

1
 64
RetailEnglish 

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

Operating system

$467.00

10
  65
OEMEnglish64-bit 

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

Operating system

$376.00

10
  66
OEMEnglish64-bit 

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

Operating system

$100.92

10
  67
OEMEnglish64-bit 

Microsoft Windows 7 Ultimate Eng (Upgrade)

Operating system

$483.35

1
 7/10
1 user review
68
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng (Upgrade)

Operating system

* $231.73

1
  69
UpgradeEnglish32/64-bit 

Microsoft Windows 7 Home Premium Eng

Operating system

$370.13

2
  70
RetailEnglish32/64-bit82

Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)

Operating system

* $261.51

2
  71
UpgradeEnglish32/64-bit 

Microsoft Windows SBS 2011 Standard 5 Device CALs Eng

Operating system

$731.40

1
 72
RetailEnglish 

Microsoft Windows 7 Professional Eng

Operating system

$525.84

2
 8/10
1 user review
73
RetailEnglish32/64-bit 

Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)

Operating system

$220.50

  74
UpgradeEnglish32/64-bit 

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

Operating system

$467.00

10
 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 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 Vista Ultimate Eng (32-bit OEM)

Operating system

$171.35

1
  86
OEMEnglish32-bit 

Microsoft Windows Vista Business Eng (64-bit OEM)

Operating system

$228.85

1
 6/10
1 user review
87
OEMEnglish64-bit 

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

Operating system

$159.85

1
  88
OEMEnglish32-bit1

Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)

Operating system

$169.00

1
  89
MUI 

Microsoft Windows 8.1 Professional Eng (Student ESD)

Operating system

$89.99

1
  90
English 

Microsoft Windows 8.1 Eng (ESD)

Operating system

$199.00

1
  91
Electronic software distribution (ESD)English 

Microsoft Windows 7 Ultimate Eng (32-bit OEM)

Operating system

$469.00

1
  92
OEMEnglish32-bit 

Microsoft Windows XP Professional Eng (OEM)

Operating system

$349.00

1
  93
OEMEnglish32-bit 

Microsoft Windows 8.1 Professional Eng (ESD)

Operating system

$349.00

1
  94
Electronic software distribution (ESD)English 

Microsoft Windows 8 Professional MUI (Upgrade fr Standard ESD)

Operating system

$397.90

1
 95
MUI 

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

Operating system

$298.02

1
  96
OEMEnglish32-bit 

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

Operating system

$1,114.75

3
  97
OEMEnglish64-bit 
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