Editing Windows NT 3.5

{{Short description|Second major release of Windows NT, released in 1994}}
{{Use mdy dates|date=March 2021}}
{{Infobox OS
| name = Windows NT 3.5
| version of = [[Windows NT]]
| logo =
| logo size = x110px
| screenshot = Windows NT 3.5.png
| caption = Screenshot of Windows NT 3.5
| developer = Microsoft
| website = 
| source_model = [[Closed source software|Closed source]]
| license = [[Commercial software|Commercial]] [[proprietary software]]
| supported_platforms = [[IA-32]], [[DEC Alpha|Alpha]], [[MIPS architecture|MIPS]], [[PowerPC]]<ref>{{cite web |url=https://archive.org/details/NT3.5PPC |title=Windows NT 3.5 for PowerPC |website=Internet Archive|date=November 9, 1994 }}</ref>
| preceded_by = [[Windows NT 3.1]] (1993)
| succeeded_by = [[Windows NT 3.51]] (1995)
| kernel_type = [[Hybrid kernel|Hybrid]]
| userland = [[Windows API]], [[NTVDM]], [[Microsoft OS/2 subsystem|OS/2 1.x]], [[Microsoft POSIX subsystem|POSIX.1]]
| first_release_date = {{Start date and age|1994|09|21}}<ref name="Reldata040809">{{cite web|last1=Adams|first1=Paul|title=Windows NT History|url=https://blogs.technet.microsoft.com/mrsnrub/2009/08/04/windows-nt-history/|website={{not typo|<nowiki>if (ms) blog++;</nowiki>}}|publisher=[[Microsoft]]|date=4 August 2009|access-date=4 October 2017|archive-date=23 April 2019|archive-url=https://web.archive.org/web/20190423013126/https://blogs.technet.microsoft.com/mrsnrub/2009/08/04/windows-nt-history/|url-status=live}}</ref>
| release_version = Service Pack 3 (3.5.807)
| release_date = {{Start date and age|1995|06|21}}<ref name="Reldata040809" />
| marketing target = Business and Server
| support_status = Support ended on December 31, 2001
}}
<!-- Deleted image removed: [[File:Windows NT 3.5 Ctrl+Alt+Delete.png|thumb|right|250px|Windows NT 3.5 startup screen with Ctrl+Alt+Delete message.]] -->
'''Windows NT 3.5''' is the second major release of the [[Windows NT]] [[operating system]] developed by [[Microsoft]], targeting the data server and personal workstation markets.<ref>{{cite thesis |url=http://dspace.qau.edu.pk:8080/jspui/bitstream/123456789/29833/1/COM%201354.pdf |title=Geographic Information System for Capital Development Authority |author=Aftab Nazir Ahmed |publisher=Quaid-I-Azam University |page=46}}</ref> It was released on September 21, 1994, as the successor to [[Windows NT 3.1]]. One of the primary goals during its development was to improve the operating system's performance. As a result, the project was [[Project code name|codenamed]] "Daytona", after the [[Daytona International Speedway]] in [[Daytona Beach, Florida]].<ref>{{Cite book |title=Microsoft Windows Internals |last1=Russinovich |first1=Mark |last2=Solomon |first2=David A. |date=8 December 2004 |publisher=Microsoft |isbn=978-0-7356-1917-3 |edition=4 |quote=The first release of Windows NT was larger and slower than expected, so the next major push was a project called "Daytona", named after the speedway in Florida. The main goals for this release were to reduce the size of the system, increase the speed of the system, and, of course, to make it more reliable. |author-link=Mark Russinovich |url-access=registration |url=https://archive.org/details/isbn_9780735619173 }}</ref> Windows NT 3.5 was succeeded by [[Windows NT 3.51]], released in 1995.<ref name="Microsoft Windows NT 3.5">{{cite web |title=Microsoft Windows NT 3.5 |url=http://www.oldcomputermuseum.com/os/windows_nt3.5.html |url-status=dead |archive-url=https://web.archive.org/web/20130323205319/http://www.oldcomputermuseum.com/os/windows_nt3.5.html |archive-date=23 March 2013 |access-date=22 September 2013 |website=Old Computer Museum}}</ref> Support and updates for Windows NT 3.5 was ended by Microsoft on December 31, 2001.

==Features==
Windows NT 3.5 comes in two editions: ''NT Workstation'' and ''NT Server''. They respectively replace the ''NT'' and ''NT Advanced Server'' editions of [[Windows NT 3.1]].<ref>{{cite web |url=http://www.oldcomputermuseum.com/os/windows_nt3.5.html |title=Microsoft Windows NT 3.5 |author=<!--Staff writer(s); no by-line.--> |website=Old Computer Museum |access-date=22 September 2013 |archive-date=23 March 2013 |archive-url=https://web.archive.org/web/20130323205319/http://www.oldcomputermuseum.com/os/windows_nt3.5.html |url-status=dead }}</ref> The Workstation edition allows only 10 concurrent clients to access the file server and does not support Mac clients.<ref>{{cite web |url=http://www.oldcomputermuseum.com/os/windows_nt3.5ser.html |title=Microsoft Windows NT 3.5 Server |website=Old Computer Museum |access-date=22 September 2013 |archive-date=2 January 2014 |archive-url=https://web.archive.org/web/20140102202735/http://www.oldcomputermuseum.com/os/windows_nt3.5ser.html |url-status=dead }}</ref>

Windows NT 3.5 includes integrated [[Winsock]] and [[TCP/IP]] support.<ref>{{cite web |url=http://www.yale.edu/pclt/WINWORLD/NT.HTM |title=TCP/IP in Windows NT 3.5 |date=9 April 1995 |website=Yale.edu |publisher=[[Yale University]] |access-date=22 September 2013 |archive-date=29 February 2000 |archive-url=https://web.archive.org/web/20000229122839/http://www.yale.edu/pclt/WINWORLD/NT.HTM |url-status=live }}</ref> (Its predecessor, Windows NT 3.1, only includes an incomplete implementation of TCP/IP based on the [[AT&T]] [[UNIX System V]] "[[STREAMS]]" API.) TCP/IP and IPX/SPX stacks in Windows NT 3.5 are rewritten.<ref>{{Cite web |url=http://support.microsoft.com/kb/140552 |title=How to Optimize Windows NT to Run Over Slow WAN Links w/TCP/IP |access-date=2010-12-18 |archive-date=2013-02-27 |archive-url=https://web.archive.org/web/20130227071334/http://support.microsoft.com/kb/140552 |url-status=live }}</ref> [[NetBIOS over TCP/IP]] (NetBT) support as a compatibility layer for TCP/IP was introduced as also the Microsoft DHCP and [[Windows Internet Name Service|WINS]] clients and DHCP and WINS servers.<ref>{{cite web |url=http://www.yale.edu/pclt/WINWORLD/NT.HTM |title=TCP/IP in Windows NT 3.5 |author=<!--Staff writer(s); no by-line.--> |date=9 April 1995 |website=Yale.edu |publisher=Yale University |access-date=22 September 2013 |archive-date=29 February 2000 |archive-url=https://web.archive.org/web/20000229122839/http://www.yale.edu/pclt/WINWORLD/NT.HTM |url-status=live }}</ref><ref>{{Cite web |url=http://support.microsoft.com/kb/169289 |title=DHCP (Dynamic Host Configuration Protocol) Basics |access-date=2009-12-27 |archive-date=2010-03-24 |archive-url=https://web.archive.org/web/20100324040943/http://support.microsoft.com/kb/169289 |url-status=live }}</ref>

Windows NT 3.5 can share files via the [[File Transfer Protocol]], and printers through the [[Line Printer Daemon protocol]]. It can act as a [[Gopher (protocol)|Gopher]], [[HTTP]], or [[Wide area information server|WAIS]] server,<ref name="TCP/IP in Windows NT 3.5">{{cite web |url=http://www.yale.edu/pclt/WINWORLD/NT.HTM |title=TCP/IP in Windows NT 3.5 |date=9 April 1995 |website=Yale.edu |publisher=Yale University |access-date=22 September 2013 |archive-date=29 February 2000 |archive-url=https://web.archive.org/web/20000229122839/http://www.yale.edu/pclt/WINWORLD/NT.HTM |url-status=live }}</ref> and includes [[Remote Access Service]] for remote dial-up modem access to LAN services using either [[Serial Line Internet Protocol|SLIP]] or [[Point-to-Point Protocol|PPP]] protocols.<ref>{{cite web |url=http://support.microsoft.com/kb/142909 |title=Files Needed to Set Up Windows NT 3.5 and 3.51 RAS |date=1 November 2006 |website=Microsoft |access-date=22 September 2013 |archive-date=25 December 2013 |archive-url=https://web.archive.org/web/20131225113444/http://support.microsoft.com/kb/142909 |url-status=live }}</ref> ''[[Windows Resource Kit|Windows NT 3.5 Resource Kit]]'' includes the first implementation of [[Microsoft DNS]].<ref name="dns35b">DNSSETUP.EXE for Beta DNS Service included in ftp://ftp.microsoft.com/bussys/winnt/winnt-public/reskit/nt35/i386/i386.exe{{Dead link|date=February 2022 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>

Other new features in Windows NT 3.5 include support for the [[VFAT]] file system, [[Object Linking and Embedding]] (OLE) version 2.0 and support for [[input/output completion port]]s.<ref>{{Cite web |url=http://www.microsoft.com/technet/sysinternals/information/IoCompletionPorts.mspx |title=Inside I/O Completion Ports |last=Russinovich |first=Mark |author-link=Mark Russinovich |date=1 November 2006 |website=Sysinternals |publisher=[[Microsoft]] |archive-url=https://web.archive.org/web/20070220042334/http://www.microsoft.com/technet/sysinternals/information/IoCompletionPorts.mspx |archive-date=20 February 2007}}</ref> Microsoft updated the [[graphical user interface]] to be consistent with that of [[Windows for Workgroups 3.11]]. NT 3.5 shows performance improvements over NT 3.1, and requires less memory.<ref name="Microsoft Windows NT 3.5"/>

Windows NT 3.5 added support for [[ATAPI]] CD-ROM. Windows NT 3.5 support for ISA PnP is not enabled by default.

==Limitations==
A lack of drivers for [[PC Card|PCMCIA cards]] limited NT 3.5's suitability for notebook computers.<ref name="TCP/IP in Windows NT 3.5"/>

To install Windows NT 3.5 on a computer that has a sixth-generation or later [[x86]] processor,<ref>{{cite web |title=Windows NT 3.5 Setup and the Pentium Pro Processor |url=http://support.microsoft.com/kb/151212/en-us |publisher=Microsoft |date=1 November 2006 |access-date=4 September 2009 |archive-date=25 February 2012 |archive-url=https://web.archive.org/web/20120225064332/http://support.microsoft.com/kb/151212/en-us |url-status=live }}</ref> one has to modify files on the installation CD-ROM.<ref name="Microsoft Windows NT 3.5"/>

==Reception==
In July 1995, Windows NT 3.5 with Service Pack 3 was rated by the [[National Security Agency]] as complying with [[Trusted Computer System Evaluation Criteria]] (TCSEC) C2 criteria.<ref>{{cite web |title=Windows NT Server 4.0 – Maintain – Revision 1.1 |url=https://technet.microsoft.com/en-us/library/cc767093.aspx |publisher=Microsoft |year=1998 |access-date=4 September 2009 |archive-date=28 February 2010 |archive-url=https://web.archive.org/web/20100228175254/http://technet.microsoft.com/en-us/library/cc767093.aspx |url-status=live }}</ref>
{{clear}}

==Support lifecycle==
{{Timeline Windows NT 3.x}}

== Source code ==
In May 2020, the full source code for the second release candidate build (build 782.1) of Windows NT 3.5, along with source code for the original [[Xbox]], leaked onto the Internet.<ref>{{Cite web |url=https://www.theverge.com/2020/5/21/21265995/xbox-source-code-leak-original-console-windows-3-5 |title=Xbox and Windows NT 3.5 source code leaks online |date=May 21, 2020 |access-date=2020-06-04 |archive-date=2020-06-04 |archive-url=https://web.archive.org/web/20200604083358/https://www.theverge.com/2020/5/21/21265995/xbox-source-code-leak-original-console-windows-3-5 |url-status=live }}</ref>

==References==
{{Reflist|30em}}

==External links==
* [http://www.guidebookgallery.org/guis/windows/winnt35 Guidebook: Windows NT 3.51 Gallery] – A website dedicated to preserving and showcasing Graphical User Interfaces

{{Microsoft Windows family}}

[[Category:1994 software]]
[[Category:Products and services discontinued in 2001]]
[[Category:Windows NT|3.5]]
[[Category:IA-32 operating systems]]
[[Category:MIPS operating systems]]
[[Category:Microsoft Windows]]