Windows NT 5.0, which would become known as Windows 2000, was Microsoft's first real attempt at making the Windows NT operating system both a viable replacement for Windows 95/98 and serious competition in the server market dominated by Unix and Unix-like systems. Windows 2000 finally brought many of Windows 9x's most important features over to the NT kernel, like a full-fledged device manager, power management through APM or ACPI, and actual support for multiple monitors and later DirectX versions.

Many enterprise customers skipped Windows 98 in favor of this operating system, and licenses of Windows 95 were sold even as late as 2000. From 1998 to 1999, Windows NT 4.0 also spiked up in usage as it was promised to provide the smoothest upgrade path to Windows 2000. While it would be another year and a half before the Windows NT family would begin to displace Windows 9x as the prime operating system for the home market, Windows 2000's conveniences made it a practical option for households nonetheless.

But of course Microsoft, being themselves, pressed on with the idea of integrating the new Internet Explorer-based shell into Windows 2000 in spite of the fact that they were sued for such an anti-competitive practice. For the systems Windows 2000 initially targeted compared to Windows 98, the extra overhead wouldn't necessarily be as severe, but still, a number of corporate laptops sold in 2001 only had 64MB of RAM, which is quite a bit less than what would allow Windows 2000 to avoid excessive virtual memory paging.

1515

Earliest leaked build of Windows NT 5.0, already has an early version of Internet Explorer 4.0 integrated

1575

A visibly unstable build with a shaky Explorer interface

1580

Earliest known build to change the shutdown dialog text

1585

A more polished build but still suffers from pink toolbar icons

1592

Early server build, introduces some shell-related features in parallel with Memphis

1627

Includes a default animated Active Desktop wallpaper

1631

Supports PnP device detection, shell is unstable

1671

Earliest leaked Beta 1 build of Windows NT 5.0, floats the idea of a "round" style in some places and introduces a new startup sound that never made it to the final release

1691

Another Beta 1 build; the Narrator program is covered here

1701

Includes an HTML-based tour for beta testers and Microsoft Management Console

1717

Pretty standard build for this time, includes a new version of IE

1723

Last leaked build from 1997, begins transitioning the GUI setup program away from the old form more and has an IE shell which matches that of Windows 98

1729

Much the same as 1723, only now it is the earliest leaked build from 1998

1738

First appearance of Safe Mode (called "Minimal Services Boot") in Windows NT

1743, 1745

Help files and other webby decorations are rebranded with blue squares, underlying shutdown routine appears to be undergoing modifications (hence 1743 crashes when shutting down)

1762

Renames "minimal services boot" and its variants to Safe Mode in boot menu, task manager features a fading-in animation

1773

Introduces the On-Screen Keyboard and fade transitions for menu popups

1796

New welcome dialog, Internet Explorer steps up to version 5.0, search dialog moved inside IE shell, "My Documents" creates a "My Pictures" folder in itself

1814

Updated logon window, last build known to still use radio buttons in the shutdown dialog rather than a drop down menu

1816

Same as the previous listed build, only it was compiled shortly before then - mentions Rosebud, code name for MSDAIPP

1835

First leaked build denoted as Beta 2. Comes with new phone dialer, the Deluxe CD Player from Plus! 98, Microsoft GS Wavetable Synth (software MIDI)

1848

Add a Windows Update shortcut to the Start menu by default, Explorer toolbar icons are smaller, some standard Windows 98 sounds implanted here

1855, 1877, 1888, 1859

Some of these builds won't install, others have missing/corrupted files that can be fixed easily

1902, 1906, 1911

1902 has an animated banner on the first Help page because internet, also includes some strange drawings made in Paintbrush for Windows (NT) 3.x. 1911 has a calculator module for Active Desktop.

1946

Beta 3 build of NT 5.0 from late 1998 that now brands itself as Windows 2000, introduces a number of new things like balloon tips and startup/shutdown sounds

1964, 1965, 1969

Earliest builds of 1999, WINNT.EXE now defaults to a floppyless installation

1983, 1989, 1993, 1994, 1999, 2000.3

New startup/shutdown sounds, sample picture, and other such polishings

2000.1, 2020, 2031

Opts for different variants of the startup/shutdown sounds

2068, 2072, 2091, 2092, 2128, 2151, 2167, 2183, 2124

Basically everything starting to take form, moving out of Beta 3 phase

2190

A build of Windows 2000 Advanced Server that leaked in 2021, hardly any different from RTM

2195

The gold release of Windows 2000 sold in retail channels and preinstalled on then new systems. More emphasis is placed on unofficial kernel extensions in this review.

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