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)$136.00 377/101 OEMEnglish64-bit 
Microsoft Windows 8.1 Eng (64-bit OEM)$137.51 40 2 OEMEnglish64-bit 
Microsoft Windows 7 Home Premium Eng (32-bit OEM)$139.00 27 3 OEMEnglish32-bit 
Microsoft Windows 7 Professional Eng (64-bit OEM)$198.00 348/104 OEMEnglish64-bit 
Microsoft Windows 8 Professional Eng (Upgrade)$129.00 295/105 UpgradeEnglish32/64-bit 
Microsoft Windows 8 Eng (64-bit OEM)* $141.00 274/106 OEMEnglish64-bit 
Microsoft Windows 8.1 Eng$159.10 25 7 RetailEnglish32/64-bit81
Microsoft Windows 7 Professional Eng (32-bit OEM)$204.15 257/108 OEMEnglish32-bit 
Microsoft Windows 8.1 Professional Eng (64-bit OEM)$195.00 438/109 OEMEnglish64-bit 
Microsoft Windows 7 Home Premium SP1 Eng (64-bit OEM)$143.23 22 10 OEMEnglish64-bit 
Microsoft Windows 8.1 Eng (32-bit OEM)$140.70 30 11 OEMEnglish32-bit 
Microsoft Windows 7 Home Premium SP1 Eng (32-bit OEM)$141.45 18 12 OEMEnglish32-bit 
Microsoft Windows 8 Eng (32-bit OEM)$127.02 24 13 OEMEnglish32-bit 
Microsoft Windows 7 Ultimate SP1 Eng (64-bit OEM)$287.50 11 14 OEMEnglish64-bit 
Microsoft Windows Home Server 2011 Eng (64-bit OEM)$102.35 56/1015 OEMEnglish64-bit 
Microsoft Windows 8.1 Professional Eng$279.11 27 16 RetailEnglish32/64-bit 
Microsoft Windows 7 Professional SP1 Eng (64-bit OEM)$199.00 24 17 OEMEnglish64-bit 
Microsoft Windows 8.1 Professional Eng (Upgrade fr Standard)$142.78 24 18 UpgradeEnglish32/64-bit 
Microsoft Windows 8 Professional Eng (64-bit OEM)$189.00 294/1019 OEMEnglish64-bit 
Microsoft Windows SBS 2011 Standard 5 User CALs Eng (OEM)$402.50 19 20 OEMEnglish64-bit 
Microsoft Windows 7 Ultimate Eng (64-bit OEM)$293.25 127/1021 OEMEnglish64-bit 
Microsoft Windows 8.1 Professional Eng (32-bit OEM)$203.85 33 22 OEMEnglish32-bit 
Microsoft Windows Server 2012 R2 Essentials 2 CPU Eng (64-bit OEM)$566.62 16 23 OEMEnglish64-bit 
Microsoft Windows Server 2012 1 User CAL Eng (OEM)$46.46 12 24 OEMEnglish 
Microsoft Windows Server 2012 R2 Standard 2 CPU Eng (64-bit OEM)$1,025.85 18 25 OEMEnglish64-bit 
Microsoft Windows 8 Professional Eng (Upgrade fr Standard)* $99.00 5 26 UpgradeEnglish32/64-bit 
Microsoft Windows Server 2008 Standard R2 SP1 Eng (64-bit OEM)$1,087.25  3 27 OEMEnglish64-bit 
Microsoft Windows 8 Professional Eng (32-bit OEM)$185.13 33 28 OEMEnglish32-bit 
Microsoft Windows 8 Eng (Upgrade)$191.35  12 29 UpgradeEnglish32/64-bit 
Microsoft Windows Server 2012 R2 Essentials 2 CPU Eng (64-bit)$538.68 7 30 English64-bit 
Microsoft Windows Server 2012 Standard 2 CPU Eng (OEM)$1,075.00 9 31 OEMEnglish64-bit 
Microsoft Windows Server 2012 Essentials Eng (OEM)$550.00 13 32 OEMEnglish64-bit 
Microsoft Windows Server 2008 R2 Standard Eng (64-bit)$2,421.90 18/1033 RetailEnglish64-bit 
Microsoft Windows Server 2012 1 Device CAL Eng (OEM)$46.46 10 34 OEMEnglish 
Microsoft Windows SBS 2011 Premium Eng$3,236.10 1 35 RetailEnglish64-bit 
Microsoft Windows SBS 2011 Premium 5 User CALs Eng$1,007.40 1 36 RetailEnglish 
Microsoft Windows SBS 2011 Standard 1 User CAL Eng (OEM)$89.45 15 37 OEMEnglish64-bit 
Microsoft Windows Server 2012 Essentials Eng$1,019.24  11 38 RetailEnglish64-bit 
Microsoft Windows 7 Professional SP1 Eng (32-bit OEM)$207.69 24 39 OEMEnglish32-bit 
Microsoft Windows 7 Ultimate Eng (Upgrade)$409.90 177/1040 UpgradeEnglish32/64-bit 
Microsoft Windows Server 2012 5 Device CALs Eng (OEM)* $210.70 8 41 OEMEnglish 
Microsoft Windows Server 2008 R2 Standard SP1 5 CALs Eng (64-bit OEM)$1,066.44  4 42 OEMEnglish64-bit 
Microsoft Windows Server 2008 R2 Enterprise SP1 Eng (64-bit OEM)$3,834.82 11 43 OEMEnglish64-bit 
Microsoft Windows Server 2008 5 Device CALs Eng (OEM)$234.60 1 44 OEMEnglish 
Microsoft Windows SBS 2011 Premium 20 User CALs Eng$3,696.10 1 45 RetailEnglish 
Microsoft Windows Server 2008 5 User CALs Eng$456.55 1 46 RetailEnglish32/64-bit 
Microsoft Windows SBS 2011 Standard 5 Device CALs Eng (OEM)$421.45 18 47 OEMEnglish64-bit 
Microsoft Windows SBS 2011 Premium 1 Device CAL Eng (OEM)$110.63 12 48 OEMEnglish64-bit 
Microsoft Windows Web Server 2008 R2 x64 Eng$1,017.75 2 49 RetailEnglish64-bit 
Microsoft Windows Server 2012 5 User CALs Eng (OEM)$230.44 11 50 OEMEnglish 
Microsoft Windows Server 2012 20 User CALs Eng$1,603.65 10 51 English 
Microsoft Windows Server 2012 Standard 5 CALs Eng$2,220.00 6 52 RetailEnglish64-bit 
Microsoft Windows 7 Home Premium Eng (Upgrade)* $231.73  1 53 UpgradeEnglish32/64-bit 
Microsoft Windows SBS 2011 Premium Eng (OEM)$1,782.50    54 OEMEnglish64-bit 
Microsoft Windows SBS 2011 Premium 5 User CALs Eng (OEM)$513.79 20 55 OEMEnglish64-bit 
Microsoft Windows 7 Home Premium Eng* $370.13  2 56 RetailEnglish32/64-bit82
Microsoft Windows Server 2012 Standard 10 CALs Eng (64-bit)$2,670.27 7 57 English64-bit 
Microsoft Windows 7 Ultimate Eng (Upgrade fr Home Premium)* $261.51  2 58 UpgradeEnglish32/64-bit 
Microsoft Windows Server 2012 R2 Datacenter 4 CPU Eng (64-bit OEM)$13,568.25  8 59 OEMEnglish64-bit 
Microsoft Windows SBS 2011 Premium 1 User CAL Eng (OEM)* $110.63  12 60 OEMEnglish64-bit 
Microsoft Windows SBS 2011 Standard 5 Device CALs Eng$731.40 1 61 RetailEnglish 
Microsoft Windows SBS 2011 Standard Eng (OEM)$1,252.35 2 62 OEMEnglish64-bit 
Microsoft Windows SBS 2008 Premium 5 User CALs Eng (OEM)* $575.58 2 63 OEMEnglish 
Microsoft Windows Server 2008 R2 Enterprise Eng (64-bit)$7,791.25 1 64 RetailEnglish64-bit 
Microsoft Windows SBS 2011 Essentials Eng$1,092.13  4 65 RetailEnglish64-bit 
Microsoft Windows Server 2012 Standard 2 Add. CPU Eng (OEM)$1,057.52 10 66 OEMEnglish64-bit 
Microsoft Windows 7 Professional Eng* $525.84  28/1067 RetailEnglish32/64-bit 
Microsoft Windows 7 Professional Eng (Upgrade fr Home Premium)$205.00    68 UpgradeEnglish32/64-bit 
Microsoft Windows 7 Ultimate SP1 Eng (32-bit OEM)$519.00  1 69 OEMEnglish32-bit 
Microsoft Windows SBS 2011 Standard 1 Device CAL Eng (OEM)$89.45 11 70 OEMEnglish64-bit 
Microsoft Windows Server 2012 5 User CALs Eng$408.24 9 71 English 
Microsoft Windows Server 2012 Datacenter 2 CPU Eng (OEM)* $5,818.40 6 72 OEMEnglish64-bit 
Microsoft Windows 7 Ultimate Eng (32-bit OEM)$332.35  2 73 OEMEnglish32-bit 
Microsoft Windows Server 2008 5 User CALs Eng (OEM)$431.66 1 74 OEMEnglish 
Microsoft Windows SBS 2011 Premium 5 Device CALs Eng (OEM)$520.96 11 75 OEMEnglish64-bit 
Microsoft Windows SBS 2011 Standard 20 User CALs Eng$2,921.00 1 76 RetailEnglish 
Microsoft Windows SBS 2011 Standard 20 Device CALs Eng$2,921.00 1 77 RetailEnglish 
Microsoft Windows 7 Professional Eng (Upgrade)$388.70 3 78 UpgradeEnglish32/64-bit 
Microsoft Windows 7 Ultimate Eng* $608.35  16/1079 RetailEnglish32/64-bit81
Microsoft Windows Server 2012 Datacenter 2 Add. CPU Eng (OEM)* $5,752.40 6 80 OEMEnglish64-bit 
Microsoft Windows Server 2012 5 Device CALs Eng$354.99 9 81 English 
Microsoft Windows Server 2012 20 Device CALs Eng$1,415.32 9 82 English 
Microsoft Windows 7 Home Premium Eng (Upgrade fr Starter)$98.97 1 83 UpgradeEnglish32/64-bit 
Microsoft Windows XP Professional Eng (OEM)$349.00  1 84 OEMEnglish32-bit 
Microsoft Windows Server 2003 5 User CALs Eng (OEM)$431.66 1 85 OEMEnglish 
Microsoft Windows Server 2003 5 Device CALs Eng (OEM)$472.14 1 86 OEMEnglish 
Microsoft Windows XP Professional x64 SP2c Eng (OEM)$498.77 1 87 OEMEnglish64-bit 
Microsoft Windows Server 2008 Standard Eng (OEM)$1,584.45  1 88 OEMEnglish32/64-bit 
Microsoft Windows Home Server Eng (OEM)$255.55  19/1089 OEMEnglish32-bit83
Microsoft Windows Server 2003 Standard x64 Eng (OEM)$1,615.11  1 90 OEMEnglish64-bit 
Microsoft Windows SBS 2003 R2 Standard SP2 Eng (OEM)$1,052.89  1 91 OEMEnglish32-bit1
Microsoft Windows SBS 2011 Premium 20 Device CALs Eng$3,696.10 1 92 RetailEnglish 
Microsoft Windows SBS 2011 Premium 5 Device CALs Eng$924.60 1 93 RetailEnglish 
Microsoft Windows Server 2012 R2 Standard 4 CPU Eng (64-bit OEM)$2,029.49  8 94 OEMEnglish64-bit 
Microsoft Windows Server 2012 R2 Standard 5 CALs Eng (64-bit)$2,318.65 7 95 English64-bit 
Microsoft Windows Server 2012 R2 Datacenter 2 CPU Eng (64-bit OEM)$6,802.89  8 96 OEMEnglish64-bit 
Microsoft Windows Vista Ultimate Eng (32-bit OEM)$171.35  2 97 OEMEnglish32-bit 
Microsoft Windows Vista Business Eng (64-bit OEM)$217.35  16/1098 OEMEnglish64-bit 
Microsoft Windows Vista Home Premium Eng (32-bit OEM)$159.85  1 99 OEMEnglish32-bit1
Microsoft Windows Vista Business SP1 Eng (32-bit OEM)$217.35  1 100 OEMEnglish32-bit 
Microsoft Windows 8.1 Professional MUI (Upgrade fr Standard)$169.00  1 101 MUI 
Microsoft Windows 8 Professional Eng (Academic Upgrade ESD)$89.99  1 102 Student upgrade E-license (ESD)English 
Microsoft Windows 8 Eng (ESD)$199.00  1 103 English 
Microsoft Windows 8 Professional Eng (ESD)$349.00  1 104 English 
Microsoft Windows 8.1 Eng (ESD)$199.00  1 105 Electronic software distribution (ESD)English 
Microsoft Windows 8.1 Professional Eng (ESD)$349.00  1 106 Electronic software distribution (ESD)English 
Microsoft Windows 8.1 Professional Eng (Student ESD) $89.99  1 107 English 
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