Operating System Beta, etc. Wiki
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Windows 8.1 is an operating system by Microsoft. It is a free upgrade for existing Windows 8 users. It reintroduces many of the features that users missed in Windows 8. It replaced Windows 8 and has been succeeded by Windows 10 in late July 2015.

Builds

Milestone 1

Buildlist-BlueDoubtful.png 9323.winmain.130222-????
Buildlist-BlueDoubtful.png 9347.0.winmain_bluem1.130220-1500
Buildlist-Green.png 9364.0.fbl_partner_out13.130315-2105
Buildlist-Green.png 9369.0.fbl_partner_out14.130324-1300

Milestone 2

Buildlist-Green.png 9374.0.fbl_partner_out15.130329-2355
Buildlist-Red.png 9375.fbl_partner_out14.130328-1742
Buildlist-Green.png 9379.0.fbl_partner_out16.130410-0711
Buildlist-BlueDoubtful.png 9380.winmain.130409-????
Buildlist-Green.png 9388.0.fbl_inx.130417-2217
Buildlist-Red.png 9388.fbl_partner_out18.130429-2155
Buildlist-Green.png 9389.0.fbl_inx_ace.130421-1800
Buildlist-BlueDoubtful.png 9402:fbl_srv2_partners.130509-2000
Buildlist-Red.png 9404.winmain_out20.130424-1425
Buildlist-Green.png 9410.fbl_partner_out21.130522-1653

Milestone Preview

Buildlist-Green.png 9411.0.winmain_bluemp.130522-1817
Buildlist-Green.png 9415.0.winmain.130524-1723
Buildlist-BlueDoubtful.png 9415.fbl_partner_out22.130525-0845
Buildlist-Green.png 9420.0.winmain.130603-1734
Buildlist-Green.png 9420.0.winmain_bluemp.130603-1815
Buildlist-Green.png 9421.0.winmain_bluemp.130604-1750
Buildlist-Green.png 9431.0.winmain_bluemp.130615-1214

Pre-RTM

Buildlist-Red.png 9433.0.winmain.130618-1322
Buildlist-Red.png 9434.0.winmain.130619-1547
Buildlist-Green.png 9453.0.winblue_rtm.130701-1010
Buildlist-Green.png 9456.0.winmain.130703-1803
Buildlist-Green.png 9460.0.winblue_rtm.130715-1059
Buildlist-Green.png 9464.0.winblue_rtm.130719-2145
Buildlist-Green.png 9466.0.winblue_rtm.130723-1416
Buildlist-Green.png 9471.0.winblue_rtm.130729-1022
Buildlist-Green.png 9477.winmain.130802-1938
Buildlist-Green.png 9477.fbl_partner_out31.130803-0736

RTM Escrow

Buildlist-Green.png 9489.0.winblue_rtm.130817-1357

Release to Manufacturing

Post-RTM

GA Update

Buildlist-Green.png 9600.16404.winblue_gdr.130913-2141

Spring 2014 Update pre-release

Buildlist-Green.png 9600.16610.winblue_s14.140201-1007
Buildlist-Red.png 9600.16615.winblue_s15.141102-1347
Buildlist-Green.png 9600.17019.winblue_gdr.140205-2003
Buildlist-Green.png 9600.17024.winblue_gdr_s14sku_partner.140214-1700
Buildlist-Green.png 9600.17025.winblue_gdr.140214-1706

Spring 2014 Update

Buildlist-Green.png 9600.17041.winblue_gdr.140305-1710
Buildlist-Green.png 9600.17238.winblue_gdr.140723-2018
Buildlist-Green.png 9600.17328.winblue_r3.140827-1500
Buildlist-Green.png 9600.17415.winblue_r4.141028-1500
Buildlist-Green.png 9600.17476.winblue_r5.141029-1500
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