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The first known build of Windows 7 was identified as a “Milestone 1 (M1) code drop” with a version number of 6.1.6519.1. It was sent to key Microsoft partners by January 2008 in both x86 and x64 versions. Though not yet commented on by Microsoft, reviews and screenshots have been published by various sources. The M1 code drop installation requires Windows Vista with Service Pack 1, and creates a dual-boot system with Windows Vista.

Microsoft introducing MinWin into its latest version of windows, developed for use in Windows 7. The MinWin development efforts are aimed towards componentizing the Windows kernel and reducing the dependencies with a view to carving out the minimal set of components required to build a self-contained kernel as well as reducing the disk footprint and memory usage. It takes up about 25 MB on disk and has a working set of 40 MB. It lacks a graphical user interface and is interfaced using a full-screen command line interface. It includes the I/O and networking subsystems.

Improvements over its NTFS brought to an introduction of WinFS into Windows 7. WinFs or Windows Future Storage is the code name for a data storage and management system based on relational databases, developed by Microsoft and first demonstrated in 2003 as an advanced storage subsystem for the Microsoft Windows operating system, being designed for persistence and management of structured, semi-structured as well as unstructured data. WinFS includes a relational database for storage of information, and allows any type of information to be stored in it, provided there is a well defined schema for the type. Individual data items could then be related together by relationships, which are either inferred by the system based on certain attributes or explicitly stated by the user.

PowerShell is also integrated within Windows 7, Windows PowerShell is an extensible command line interface shell and associated scripting language from Microsoft. It was released in 2006 and is currently available for Windows XP SP2, Windows Server 2003, Windows Vista and is built into Windows Server 2008 as an optional feature.

Overall windows 7 more or less looks and feels like windows vista.