List of Microsoft codenames
OS components

List of Microsoft codenames

Section Title: OS components
Table Section Text: None

Codename	Preliminary name	Final name	Notes	Ref

Barcelona	N/A	Windows Defender Application Guard	A security feature for running the Microsoft Edge web browser inside a virtual machine, thus isolating it from the rest of the system in the event that it was hacked.

Beihai	Paint 3D	3D version of Microsoft Paint

Code Integrity Rooting	Secure Startup	BitLocker	A security feature that checks and validates the integrity of Windows boot and system components.

Continuum	Tablet Mode	Continuum	A Windows 10 feature that enables hybrid devices to switch between tablet mode and desktop mode. An immediately manifest effect is the Start screen getting maximized in tablet mode.

Cornerstone	Secure Startup	BitLocker	Full disk encryption feature introduced in Windows Vista and present in subsequent versions that utilizes the Trusted Platform Module to perform integrity checking prior to operating system startup.

Assistant	N/A	Cortana	An intelligent personal assistant included with Windows 10, named after an artificial intelligence character in Halo

Cougar	N/A	VMM32	32-bit kernel

Darwin	Microsoft Installer	Windows Installer	A Windows service and application programming interface for installing software on computers running Microsoft Windows operating systems

Frosting	Windows 95 codename	Microsoft Plus! for Windows 95

Hydra	N/A	Terminal Services, Windows Terminal Server	Terminal Server adds "multiheading" support to Windows (the ability to run multiple instances of the graphics subsystem), and the hydra is a mythological monster with multiple heads.

Jaguar	N/A	N/A	16-bit DOS kernel for Windows 95 based on MS-DOS 5.0, used by Windows 95 boot loader and compatibility layer.

Jupiter	N/A	Windows Runtime	A new application framework on Windows 8 used to create cross-platform "immersive" apps.

Monad	MSH, Microsoft Shell	Windows PowerShell	"Monads", according to philosopher Gottfried Leibniz's monadology, are the ultimate elements of the universe, individual percipient beings, and MSH is similarly composed of small, individual modules the user puts in interrelation.

Morro	N/A	Microsoft Security Essentials	MSE was codenamed after the Morro de São Paulo beach in Brazil.

Neon	N/A	Fluent Design	Microsoft Fluent Design System is a revamp of the Windows UI based around five key components: Light, Depth, Motion, Material, and Scale.

O'Hare	N/A	Internet Explorer 1	Internet Explorer 1, first shipped in Microsoft Plus! for Windows 95: The codename O'Hare ties into the Chicago codename for Windows 95: O'Hare International Airport is the largest airport in the city of Chicago, Illinois — in Microsoft's words, "a point of departure to distant places from Chicago".

Panther	N/A	N/A	Cancelled. Panther was a 32-bit kernel based on Windows NT kernel.

Pinball	N/A	High Performance File System (HPFS)	"Pinball" is the nickname (as opposed to a codename) for HPFS because HPFS driver in Windows NT 3.5 is called PINBALL.SYS.

Piton	N/A	ReadyDrive	Feature introduced in Windows Vista to support hybrid drives

Protogon	N/A	ReFS	The successor of NTFS

Rincon	N/A	Internet Explorer 7	Rincon is a surfing beach in Puerto Rico

Spartan	N/A	Microsoft Edge	Web browser for Windows 10 that does away with MSHTML rendering engine. Refers to Spartans in Halo.

Stimpy	N/A	Windows Shell	Applies to Windows 95 only.

Viridian	N/A	Hyper-V	Virtualization update for Windows Server 2008

WinFS	N/A	N/A	A cancelled data storage and management system project based on relational databases, first demonstrated in 2003 as an advanced storage subsystem for the Microsoft Windows, designed for persistence and management of structured, semi-structured as well as unstructured data.

Sentence(s)

Microsoft developed its assistant for the Windows operating system under the codename "Cortana" in reference to the Halo character.

final_sentence: Microsoft developed its assistant for the Windows operating system under the codename "Cortana" in reference to the Halo character.