Editing Windows Neptune (section)

{{Short description|Cancelled Microsoft product}}
{{Self-published sources|date=April 2023}}<!-- namely BetaArchive, The Collection Book, and YouTube -->
{{Use mdy dates|date=October 2024}}
{{Infobox OS
| name = Windows Neptune
| logo = File:Windows Neptune logo.svg
| logo caption = 
| screenshot = File:Windows Neptune.png
| caption = Neptune build 5111's desktop
| version of = [[Windows NT]]
| developer = Microsoft
| working state = Historic, never released
| license = [[Non-disclosure agreement]]<ref name=gold />
| website = <!--Does not have a website-->
| logo_size = 206px<!--Native size, supplied to prevent distortion -->
| preview_version = 5.00.5111 (kernel reports)<br>5.50.5111 (version in many files)
| preview_date = {{start date and age|1999|12|27}}<ref>{{cite web|last1=Thurrott|first1=Paul|title=The Road to Gold: The development of Windows XP Reviewed|url=http://winsupersite.com/article/product-review/the-road-to-gold-the-development-of-windows-xp-reviewed|website=SuperSite for Windows|publisher=[[Penton Media]]|access-date=12 August 2014|date=6 October 2010}}</ref>
| source_model = <!--No one knows-->
| kernel_type = [[Windows NT]]
| marketing target = Consumer
| support_status = Cancelled
}}<!-- approximate date of template insertion for dating hidden maintenance categories -->
__NOTOC__
'''Neptune''' was the [[codename]] for a version of [[Microsoft Windows]] under development in 1999. Based on [[Windows 2000]], it was originally to replace the [[Windows 9x]] series<ref>{{cite web|url=http://news.zdnet.co.uk/emergingtech/0,1000000183,2072502,00.htm|title=Neptune - the new Windows|date=July 5, 1999|work=[[ZDNet]]|url-status=live|archive-url=http://web.archive.org/web/20080725000000/http://news.zdnet.co.uk/emergingtech/0,1000000183,2072502,00.htm|archive-date=25 July 2008|access-date=2010-01-07}} [https://www.zdnet.com/article/neptune-the-new-windows/ Alt URL]</ref> and was scheduled to be the first home consumer-oriented version of Windows built on [[Windows NT]] code. Internally, the project's name was capitalized as '''N'''ep'''T'''une.<ref>{{cite web |url=http://antitrust.slated.org/www.iowaconsumercase.org/011607/7000/PX07297.pdf |title=Platforms Group - Desktop Three-Year Outlook |work=Microsoft Corporation |date=February 1998 |access-date=2010-01-08}}</ref>