| MS-DOS | |
| Newdos | MS-DOS 4.1 |
| Lifeboat | Improved version of DOS 4.0, never finished |
| Jetski | Improved version of DOS 4.0, became MS-DOS 5 |
| Astro | MS-DOS 6.0 |
| Elroy | MS-DOS 6.1 |
| Elroy | MS-DOS 6.2 |
| Bambi | MS-DOS 6.22 SmartDrive |
| Evanston, Chico, Felix | MS-DOS 7.0 |
| Windows | |
| Captian , Slick | Early efforts to combine DOS and Windows, became “Jastro” |
| Jastro | “Non-Upgrade combined DOS/Windows setup” (Setup installs MS-DOS first and then Windows 3.1) |
| Janus | Windows 3.1 |
| Kato, Sparta | Windows for Workgroups 3.1 |
| Snowball | Windows for Workgroups 3.11 |
| Gryphon, Haiku | Modular Windows |
| AVI | Video for Windows |
| Winball | Networking for Windows |
| Foghorn | Windows Sound System |
| Jumbo | Windows Printing |
| Windows 4.0 | Very early codename for Windows 95 (around 1990) |
| Jaguar | Chicago kernel |
| Cougar | 32bit protected mode kernel which runs on top of Jaguar |
| Chicago | Windows 95 |
| Cleveland | Planned successor of Chicago, became Nashville |
| Nashville | Windows 96, “Merge Internet and Desktop together” Project, Active Desktop |
| Frosting | Plus! for Windows 95 |
| Detroit | Windows 95 OSR 2.1 |
| ChiCairo | Early codename for Windows 98, when “Memphis NT” was still planned as a successor of Cairo |
| London | OLE-2 Based Shell and environment on top of Chicago (became Memphis later) |
| Memphis | Windows 98 |
| Dolly | Windows 98 OEM/Corporate image cloning utility |
| Millennium | Windows Millennium Edition |
| Tiger | Microsoft NetShow |
| NTOS | Windows NT Kernel, “David Cutler’s NT” |
| NT OS/2 | Windows NT 3.1 |
| NT 1.0 | Preliminary name for Windows NT 3.1 |
| Daytona | Windows NT 3.5 |
| Cleveland | Planned successor of Daytona |
| Newshell | Shell Update Release for Windows NT 3.51 |
| Cairo | Planned successor of Daytona, Windows NT 4.0 |
| Impala | Windows NT 4.0 Embedded |
| Hydra | Windows Terminal Server |
| Wolfpack | Microsoft Cluster Server |
| Catapult | Microsoft Proxy Server |
| Sam | Microsoft BackOffice Small Business Server 4.0 |
| Horton | Microsoft BackOffice Small Business Server 4.5 |
| Memphis NT | Very early codename for Windows 2000 (around 1995/96) |
| NT 5.0 | Windows 2000 |
| Janus | Windows 2000 64-bit |
| Asteroid | Windows 2000 Service Pack 1 |
| W2KSRP | Windows 2000 Service Pack 4 Update Rollup |
| Neptune | Planned Windows 2000 successor (minor update, NT 5.50), merged into Whistler |
| Triton | Planned Neptune Service Pack 1 |
| Odyssey | Planned Neptune successor (major update, NT 6.0) |
| Whistler | Windows XP |
| Sundown | Windows XP 64-bit |
| Anvil, x64 Client | Windows XP Professional x64 Edition |
| Trainyard | Windows XP Service Pack 1 |
| Springboard | Windows XP Service Pack 2 |
| Mantis | Windows XP Embedded |
| Chinook | Windows Embedded for Point of Service |
| Mönch, Eiger | Windows Fundamentals for Legacy PCs |
| Creekside | Windows XP Starter Edition |
| Mira/Lone Star | Windows XP Tablet PC Edition |
| Vex | Windows XP Tablet PC Edition 2005 |
| eHome | Windows XP Media Center Edition |
| Freestyle | Windows XP Media Center Edition 2003 |
| Harmony | Windows XP Media Center Edition 2004 |
| Symphony | Windows XP Media Center Edition 2005 |
| Emerald | Windows XP Media Center Edition 2005 Update Rollup 2 |
| Lime | Plus! Digital Media Edition |
| Whistler Server | Early codename for Windows Server 2003 |
| .NET Server | Windows Server 2003 |
| Hammer | Windows.NET Server x86-64 |
| Blade Server | Windows Server 2003 Web Edition |
| R2 | Windows Server 2003 R2 |
| Bobcat | Windows Small Business Server 2003 |
| Cougar | Windows Small Business Server 2003 R2 |
| Evergreen | Windows Small Business Server 2003 R2 Service Pack 2 |
| Thunderclap | Windows Storage Server 2003 |
| Storm | Windows Storage Server 2003 R2 |
| Plato | Windows Compute Cluster Server 2003 |
| Q, Quattro | Windows Home Server |
| Update Release 1 (UR1) | Windows Home Server Power Pack 1 (PP1) |
| Snoqualmie | Windows Home Server Power Pack 2 (PP2) |
| Whistler+1 | Early codename for Longhorn |
| Longhorn/Omega 13 | Windows Vista |
| Excalibur | Planned Longhorn Media Center |
| Diamond | Windows Vista Media Center |
| Fiji | Windows Vista Media Center 2008 |
| Quebec | Windows Embedded Standard 2009 |
| Longhorn Server | Windows Server 2008 |
| Cougar | Windows Small Business Server 2008 |
| Centro | Windows Essential Business Server 2008 |
| Viridian | Windows Hyper-V Server 2008 |
| Socrates | Windows HPC Server 2008 |
| Lima | Windows Server 2008 Foundation |
| Magni | Windows Storage Server 2008 |
| Blackcomb, Vienna | Early codename for Windows 7 |
| 7 | Windows 7 |
| Quebec | Windows Embedded Standard 7 (formerly Windows Embedded Standard 2011) |
| Server 7 | Windows Server 2008 R2 |
| Hyper-V R2 | Windows Hyper-V Server 2008 R2 |
| Solution Server (?) | Windows MultiPoint Server 2010 |
| WMS 2 | Windows MultiPoint Server 2011 |
| WHS Vail | Windows Home Server 2011 |
| SBS Aurora | Windows Small Business Server 2011 Essentials |
| SBS 7 | Windows Small Business Server 2011 Standard |
| Breckenridge | Windows Storage Server 2008 R2 Essentials |
| Colorado | Vail/Aurora SDK/toolkit |
| 8 | Upcoming Windows version |
| Server 8 | Upcoming Windows Server version |
| Red Dog, Strata | Windows Azure |
| Windows CE, Windows Mobile | |
| Pegasus | Windows CE 1.0 |
| Pegasus Manager | H/PC Explorer |
| Alder | Windows CE 2.0 |
| Axe | Windows CE 2.0 Embedded Toolkit |
| Mercury | Windows CE 2.0, “Handheld PC 2.0? |
| Gryphon | Windows CE 2.01, “Palm PC 1.0? |
| Apollo | Windows CE 2.01, “Auto PC 1.0? |
| Alder Enhancement Pack (EP) | Windows CE 2.10 |
| Axe EP | Windows CE 2.10 Embedded Toolkit |
| Birch | Windows CE 2.11 |
| Buzzsaw | Windows CE 2.11 Platform Builder |
| Jupiter | Windows CE 2.11, “Handheld PC Professional (3.0)” |
| Orion | Windows CE 2.11, “Palm-Sized PC 1.1? |
| Wyvern | Windows CE 2.11, “Palm-Sized PC 1.2? |
| Hermes | Windows CE 2.11 for Webphones |
| Birch SP2 | Windows CE 2.12 |
| Goldeneye | Windows CE 2.12, “Auto PC 2.0? |
| Cedar | Windows CE 3.0 |
| Chainsaw | Windows CE 3.0 Platform Builder |
| Rapier | Windows Pocket PC 2000 |
| Galileo | Windows Handheld PC 2000 |
| Merlin | Windows Pocket PC 2002 |
| Stinger | Windows Smartphone 2002 |
| Talisker | Windows CE 4.0 |
| Jameson | Windows CE 4.1 |
| McKendric | Windows CE 4.2 |
| Ozone | Windows Mobile 2003 |
| Ozone update | Windows Mobile 2003 Second Edition |
| Macallan | Windows CE 5.0 |
| Tomatin | Windows CE 5.0 Networked Media Device (NMD) Feature Pack |
| Magneto | Windows Mobile 5.0 |
| Crossbow | Windows Mobile 6.0 |
| Cardhu, Yamazaki | Windows Embedded CE 6.0 |
| Cashmere | Windows Embedded CE 6.0 R3 |
| Photon | Windows Mobile 7 (cancelled) |
| Chelan | Windows Embedded Compact 7 |
| Windows Phone 7 Series | Windows Phone 7 |
| Metro | Windows Phone 7 UI |
| Mango | next Windows Phone version, possibly Windows Phone 7.5 (scheduled for August/September 2011) |
| Apollo | next major Windows Phone version, possibly Windows Phone 8 (scheduled for 2012) |
| Internet Explorer | |
| O’Hare | Internet Explorer 1 |
| Oxygen | Internet Explorer 3 |
| Trident | MSHTML (layout engine for Internet Explorer 4.0+) |
| Nashville | Internet Explorer 4 |
| Haley, Mars | Internet Explorer 5.5 |
| Rincon | Internet Explorer 7 |
| Teahapoo, IE.Next | Internet Explorer 8 |
| Media Player | |
| Quartz, ActiveMovie | DirectShow |
| ActiveMovie Player | Windows Media Player |
| Helix | Windows Media Player 8 |
| Corona | Windows Media Player 9 |
| Crescent | Windows Media Player 10 |
| Polaris | Windows Media Player 11 for Windows XP |
| Aurora | Windows Media Player 11 for Windows Vista |
| Kestral | Windows Media Player for Pocket PC |
| Pyranha | Windows Media Player for Smartphone 2002 |
| Changeling | Windows Media Player for Mac OS X |
| Artemis | Windows Media Format SDK |
| Zeus | Windows Media Format 9 SDK |
| Pegasus | Windows Media Video 9 Advanced Profile Encoder |
| Hercules | Windows Media Server .NET |
| Office | |
| Office 9 | Office 2000 |
| Office 10 | Office XP |
| Next Generation Office (NGO), Office .NET, Office 11 | Office 2003 |
| Avignon | Office Visio 2003 |
| Vienna | Office Live Communications Server 2005 |
| Live Server | Office Communications Server 2007 |
| Office 12 | Office 2007 |
| Office 14 | Office 2010 |
| Office 15 | Upcoming Office version |
| Visual Studio | |
| Rainier | Visual Studio .NET (2002) |
| Everett | Visual Studio 2003 |
| Venus | Visual Web Developer Express Edition |
| Whidbey | Visual Studio 2005 |
| Orcas | Visual Studio 2008 |
| Burton, Rosario | Visual Studio 2008 Team System |
| Hawaii, Dev10 | Visual Studio 2010 |