List of Microsoft codenames

codenameMicrosoft codenamescodenamedLonghornAuroracode namecode-namecode-namedinternal codenameList of Microsoft software codenames
Microsoft codenames are given by Microsoft to products it has in development, before these products are given the names by which they appear on store shelves.wikipedia
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Windows 98

98Microsoft Windows 98Windows 98 Second Edition
Windows 98 (codenamed Memphis) is a personal computer operating system developed by Microsoft as part of its Windows 9x family of Microsoft Windows operating systems.

Microsoft Neptune

Windows NeptuneNeptuneWindows "Neptune
Neptune was the codename for a version of Microsoft Windows under development in 1999.

Windows Server 2003

Server 20032003Windows Server 2003 R2
When first announced in 2000, it was known by its codename "Whistler Server"; it was named "Windows 2002 Server" for a brief time in mid-2001, followed by "Windows .NET Server" and "Windows .NET Server 2003".

Windows Installer

MSI.msiSetup API
Windows Installer (previously known as Microsoft Installer, codename Darwin) is a software component and application programming interface (API) of Microsoft Windows used for the installation, maintenance, and removal of software.

Microsoft Plus!

Microsoft Plus! for Windows 95Microsoft Plus! 98Plus! for Windows 95
product was first announced on January 31, 1994 under the internal codename "Frosting".


Object File SystemItemnext-generation file system
WinFS (short for Windows Future Storage) was the code name for a canceled data storage and management system project based on relational databases, developed by Microsoft and first demonstrated in 2003 as an advanced storage subsystem for the Microsoft Windows operating system, designed for persistence and management of structured, semi-structured and unstructured data.


Microsoft CortanaMicrosoft's CortanaCortain
Originally Cortana was only meant to be a codename, but a petition on Windows Phone's UserVoice site that proved to be popular made the codename official.

Code name

It is not uncommon for Microsoft to reuse codenames a few years after a previous usage has been abandoned.

Windows XP Media Center Edition

Windows XP Media Center Edition 2005Windows XP Media CenterMedia Center Edition

Microsoft Security Essentials

Microsoft Malware Protection CenterWindows Security EssentialsMS Essentials
On November 18, 2008, Microsoft announced plans for a free consumer security product, codenamed Morro.

Microsoft Forefront Threat Management Gateway

Microsoft Proxy ServerISA ServerThreat Management Gateway
Developed under the code-name "Catapult", Microsoft Proxy Server v1.0 was first launched in January 1997, and was designed to run on Windows NT 4.0.

Cortana (Halo)

Cortanaartificial intelligence characterCortana (''Halo'')
Microsoft developed its virtual assistant for the Windows Phone operating system under the codename "Cortana" in reference to the Halo character.

Development of Windows Vista

LonghornWindows Longhornseveral years struggling
Vista's original codename, "Longhorn", was an allusion to this plan: While Whistler and Blackcomb are large ski resorts in British Columbia, Longhorn is the name of a bar between the two mountains that Whistler's visitors pass to reach Blackcomb.

Microsoft Layer for Unicode

It had a codename of Godot, which is a reference to the play Waiting for Godot (centered around the failure of a man named "Godot" to appear and the endless wait for him), because it was felt to be long overdue.


Microsoft CorporationMicrosoft Corp.MS
Microsoft codenames are given by Microsoft to products it has in development, before these products are given the names by which they appear on store shelves.

Information technology

ITinformation technologiescomputer industry
Many of these products (new versions of Windows in particular) are of major significance to the IT community, and so the terms are often widely used in discussions prior to the official release.

Windows NT