Editing Windows 95 (section)

===Editions===
{{redirect|OSR2|the gene|OSR2 (gene)}}

Several Windows 95 editions have been released. Only the original release was sold as a shrink-wrapped product; later editions were provided only to computer [[OEM]]s for installation on new PCs. For this reason, these editions are known as '''OEM Service Releases''' ('''OSR''').

Together with the introduction of Windows 95, Microsoft released the ''[[Microsoft Plus!]] for Windows 95'' pack, which contained several optional components for high-end multimedia PCs, including Internet Explorer, DriveSpace and additional themes.

The first service pack was made available half a year after the original release and fixed several small bugs.<ref>{{Cite web|url=http://support.microsoft.com/support/kb/articles/Q143/0/03.ASP|title=Q143003 - Description of Microsoft Windows 95 Service Pack 1 Updates|publisher=Microsoft|date=December 14, 2000|url-status=dead|archive-url=https://web.archive.org/web/20010105085400/http://support.microsoft.com/support/kb/articles/Q143/0/03.ASP|archive-date=January 5, 2001}}</ref>

The second service pack mainly introduced support for new hardware, most notably support for hard drives larger than 2 GB in the form of the [[FAT32]] file system.<ref>{{Cite web|url=http://support.microsoft.com/support/kb/articles/Q155/0/03.ASP|title=Q155003 - Description of Windows 95 OEM Service Release 2|publisher=Microsoft|date=December 15, 2000|url-status=dead|archive-url=https://web.archive.org/web/20010207044251/http://support.microsoft.com/support/kb/articles/Q155/0/03.ASP|archive-date=February 7, 2001}}</ref> This release was never made available to end-users directly and was only sold through OEMs (OSR2) with the purchase of a new PC. <!-- possibly hard drive -->

A full third service pack was never released, but two smaller revisions to the second were released in the form of a USB Supplement (OSR2.1) and the [[Windows Desktop Update]] (OSR2.5).<ref>{{Cite web|url=http://support.microsoft.com/support/kb/articles/Q178/9/72.ASP|title=Q178972 - Description of Windows 95 OEM Service Release 2.5|publisher=Microsoft|date=December 15, 2000|url-status=dead|archive-url=https://web.archive.org/web/20010210011401/http://support.microsoft.com/support/kb/articles/Q178/9/72.ASP|archive-date=February 10, 2001}}</ref><!-- citation needed: vaguely remember this being done under pressure from OEMs/Gateway which needed USB support more quickly, 4.03 version number certainly suggests this was originally planned as SP3. --> Both were made available as updated disc images shipped by OEMs, and the Windows Desktop Update was also released with the standalone Internet Explorer 4.0 release. OSR2.5 was notable for featuring several changes to the Windows Explorer, integrating it with Internet Explorer 4.0—this version of Internet Explorer looks very similar to the one featured in Windows 98.

{| class=wikitable style="font-size: 80%; text-align: center; width: 100%"
|-
!scope="col" rowspan=2| Release
!scope="col" rowspan=2| Code name
!scope="col" rowspan=2| Release date
!scope="col" rowspan=2| CD-Code<ref>{{cite web|title=Version from CD?|url=https://forums.tomshardware.com/threads/version-from-cd.1143477/#post-8457858|publisher=Tom's Hardware|date=September 3, 2005|access-date=November 23, 2023|archive-date=November 23, 2023|archive-url=https://web.archive.org/web/20231123224339/https://forums.tomshardware.com/threads/version-from-cd.1143477/#post-8457858|url-status=live}}</ref><ref>{{cite web|title=Identifikation der Betriebssysteme|url=http://www.win-dos.com/verident.shtml |archiveurl=https://web.archive.org/web/20170830194925/http://www.win-dos.com/verident.shtml|archivedate=August 30, 2017|publisher=www.win-dos.com}}</ref><ref>{{cite web|title=Windows 95/98/ME Versions Features|url=http://www.emsps.com/oldtools/mswin95v.htm|publisher=EMS|access-date=November 23, 2023|archive-date=May 6, 2024|archive-url=https://web.archive.org/web/20240506071811/http://www.emsps.com/oldtools/mswin95v.htm|url-status=live}}</ref>
!scope="col" colspan=3| Version <!-- first column: version as reported in the My Computer property sheet; second column: version as reported by the updated system files and microsoft knowledge base -->
!scope="col" colspan=5| Software components
!scope="col" colspan=9| Hardware support
|-
!scope="col" | System properties{{efn|The version string displayed in the "System properties" tab. Right-click on "My Computer" and choose "Properties".}}
!scope="col" | System files{{efn|The version of updated system files. Note that most system files which have not been updated often retain their old version number. Version numbers are not consistently used: some system files may have older or newer build numbers or use a version numbering scheme separate from regular system files.}}
!scope="col" | Timestamp
!scope="col" | [[MS-DOS]]
!scope="col" | [[Internet Explorer]]{{efn|Upgradable to 5.5}}
!scope="col" | [[DriveSpace]]
!scope="col" | [[OpenGL]]
!scope="col" | [[DirectX]]{{efn|Upgradable to 8.0a}}
!scope="col" | [[FAT32]]
!scope="col" | [[Infrared Data Association|Infrared]]<ref>{{cite web|url=http://support.microsoft.com/kb/139445|title=Windows 95 Support for Infrared Data Association Connectivity|date=November 15, 2006|publisher=Microsoft|url-status=live|archive-url=https://web.archive.org/web/20070305002902/http://support.microsoft.com/kb/139445|archive-date=March 5, 2007|access-date=September 9, 2009}}</ref>
!scope="col" | [[UDMA]]<ref>{{cite web|url=http://support.microsoft.com/kb/258757|title=How to Enable Direct Memory Access (DMA)|date=January 27, 2007|publisher=Microsoft|url-status=live|archive-url=https://web.archive.org/web/20060627023357/http://support.microsoft.com/kb/258757/|archive-date=June 27, 2006|access-date=September 9, 2009}}</ref>
!scope="col" | [[Interrupt request (PC architecture)|IRQ]] steering<ref>{{cite web|url=http://support.microsoft.com/kb/182604|title=Description of PCI Bus IRQ Steering|date=January 22, 2007|publisher=Microsoft|url-status=live|archive-url=https://web.archive.org/web/20070205082434/http://support.microsoft.com/kb/182604|archive-date=February 5, 2007|access-date=September 9, 2009}}</ref>
!scope="col" | [[USB]]
!scope="col" | [[IEEE 1394]]
!scope="col" | [[Accelerated Graphics Port|AGP]]
!scope="col" | [[MMX (instruction set)|MMX]]<ref>{{cite web |title=GP Fault or Fatal Exception Error on Intel MMX CPU |url=http://support.microsoft.com/kb/156492 |access-date=June 9, 2018 |archive-url=https://web.archive.org/web/20140904184422/http://support.microsoft.com/kb/156492 |archive-date=September 4, 2014}} [https://jeffpar.github.io/kbarchive/kb/156/Q156492/ Alt URL] {{Webarchive|url=https://web.archive.org/web/20180612141815/https://jeffpar.github.io/kbarchive/kb/156/Q156492/ |date=June 12, 2018 }}</ref>
!scope="col" | [[P6 (microarchitecture)|P6]]<ref>{{cite web |title=Microsoft KB Archive/178972 |url=https://www.betaarchive.com/wiki/index.php?title=Microsoft_KB_Archive/178972 |access-date=27 July 2024 |archive-date=August 5, 2024 |archive-url=https://web.archive.org/web/20240805022854/https://www.betaarchive.com/wiki/index.php?title=Microsoft_KB_Archive/178972 |url-status=live }}</ref><ref>{{cite web |title=Microsoft KB Archive/179897 |url=https://www.betaarchive.com/wiki/index.php?title=Microsoft_KB_Archive/179897 |access-date=27 July 2024 |archive-date=August 5, 2024 |archive-url=https://web.archive.org/web/20240805022904/https://www.betaarchive.com/wiki/index.php?title=Microsoft_KB_Archive/179897 |url-status=live }}</ref><ref>{{cite web |title=Memory Management Problems on Computers with Pentium Processors |url=http://support.microsoft.com/kb/179897 |website=KnowledgeBase Archive |access-date=June 9, 2018 |archive-url=https://web.archive.org/web/20140904184423/http://support.microsoft.com/kb/179897 |archive-date=September 4, 2014}} [https://jeffpar.github.io/kbarchive/kb/179/Q179897/ Alt URL] {{Webarchive|url=https://web.archive.org/web/20180612142733/https://jeffpar.github.io/kbarchive/kb/179/Q179897/ |date=June 12, 2018 }}</ref>
|-
!scope="row" | Windows 95 (retail and OEM)
| Chicago
|rowspan=2| August 24, 1995
| 0795
| 4.00.950
| 4.00.950<!-- Unverified:<ref group="note">This version of Windows 95 is sometimes called "950r6" because there were five prior release candidates of build 950. Release candidate 6 was the build that shipped in retail boxes.</ref> -->
| 1995-07-11 09:50:00
|rowspan="4"| 7.0
| 1.0 OEM only
| 2
|rowspan="4" {{n/a}}
|rowspan="4" {{n/a}}
|rowspan="4" {{no}}
|rowspan="2" {{no}}
|rowspan="4" {{no}}
|rowspan="4" {{no}}
|rowspan="5" {{no}}
|rowspan="4" {{no}}
|rowspan="5" {{no}}
|rowspan="4" {{partial|Bugs}}
|rowspan="4" {{partial|Bugs}}
|-
!scope="row" | Microsoft Plus! for Windows 95
| Frosting
| {{n/a}}
| {{n/a}}||4.40.310||1995-07-14 04:40:00
| 1.0
| 3
|-
!scope="row" | Service Pack 1
|rowspan=3 {{n/a}}
|rowspan=2| February 14, 1996<ref>{{cite web|title=Microsoft Releases Windows 95 Service Pack|url=http://news.microsoft.com/1996/02/14/microsoft-releases-windows-95-service-pack/|publisher=Microsoft|date=February 14, 1996|access-date=November 10, 2016|archive-date=November 12, 2016|archive-url=https://web.archive.org/web/20161112022713/http://news.microsoft.com/1996/02/14/microsoft-releases-windows-95-service-pack/|url-status=live}}</ref>
| {{n/a}}
|rowspan="2"| 4.00.950a <!-- as displayed in the system properties tab: LOWER CASE "a", WITHOUT a space between the build number and the "a" --> ||rowspan="2"|4.00.951{{efn|Some components have higher build numbers up to 955.}}
|1995-12-31 09:50:00
|rowspan="2"| [[Internet Explorer 2|2.0]]<ref>{{cite web|url=http://support.microsoft.com/kb/146449|title=Description of Microsoft Windows 95 Service Pack 1 Components|date=November 16, 2006|publisher=Microsoft|url-status=live|archive-url=https://web.archive.org/web/20041112224307/http://support.microsoft.com/kb/146449|archive-date=November 12, 2004|access-date=July 16, 2010}}</ref>
|rowspan="2"| 2
|rowspan="6" {{yes}}
|-
!scope="row" | OEM Service Release 1
| 0196
| 1995-12-29 09:51:00
|-
!scope="row" | OEM Service Release 2
| August 30, 1996
| 0796
|rowspan="2"| 4.00.950 B <!-- as displayed in the system properties tab: capital B, with a space between the build number and B -->
| 4.00.1111
| 1996-08-24 11:11:11
|rowspan="3"| 7.1
|rowspan="2"| [[Internet Explorer 3|3.0]]
|rowspan="3"| 3
|rowspan="3"| 1.1
|rowspan="2"| 2.0a
|rowspan="3" {{yes}}
|rowspan="3" {{yes}}
|rowspan="3" {{yes}}
|rowspan="3" {{yes}}
|rowspan="3" {{yes}}
|rowspan="2" {{yes}}*{{efn|With the Memory Management fix (VMM2XUPD.EXE) applied (official),<ref>{{cite web |title=Memory Management Problems on Computers with Pentium Processors |url=http://support.microsoft.com/support/kb/articles/q179/8/97.asp |access-date=29 July 2024 |archive-date=October 7, 2001 |archive-url=https://web.archive.org/web/20011007022425/http://support.microsoft.com/support/kb/articles/Q179/8/97.ASP |url-status=live }}</ref> or with the updated USB supplement (4.03.1216) (unofficial for OSR2/2.1).<ref>{{cite web |title=Availability of Universal Serial Bus Support in Windows 95 |url=http://support.microsoft.com/kb/253756/EN-US/ |access-date=29 July 2024 |archive-date=May 8, 2014 |archive-url=https://web.archive.org/web/20140508025511/http://support.microsoft.com/kb/253756/EN-US |url-status=live }}</ref>}}
|-
!scope="row" | OEM Service Release 2.1
| Detroit
| August 27, 1997<ref>{{cite web|url=http://support.microsoft.com/kb/158238|title=How to Determine the Version of Windows 95/98/Me in Use|date=May 12, 2007|publisher=Microsoft|url-status=live|archive-url=https://web.archive.org/web/20041026005132/http://support.microsoft.com/kb/158238|archive-date=October 26, 2004|access-date=September 9, 2009}}</ref>
| 0197 (US) / 0397
| 4.03.1212{{efn|Original release of the USB Supplement to OSR2.}}<br />4.03.1214{{efn|Updated version of the USB Supplement to OSR2.}}<br />
4.03.1216 (unofficial, with the updated USB supplement){{Efn|name=4.03.1214|The Microsoft Knowledge Base reports 4.03.1214. This USB Supplement to OSR2 (included with OSR2.5 only, named '''usbupd2.exe''') contains an updated VMM.VXD with support for the Pentium Pro and Pentium II. This file has version 4.03.1216 and has a timestamp of September 23, 1997 09:51:18.}}
| 1997-04-10 12:14:00
|rowspan="2" {{yes}}
|rowspan="2" {{yes}}
|-
!scope="row" | OEM Service Release 2.5
| {{n/a}}
| November 26, 1997
| 1297
| 4.00.950 C<!-- as displayed in the system properties tab: capital C, with a space between the build number and C --> ||4.03.1216{{efn|name=4.03.1214}}
| 1997-11-26 12:16:00
| [[Internet Explorer 4#Overview|4.00]]
| 5.0
| {{Yes}}
|}
{{Notelist|30em}}