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For the NPC in Icecrown, see "Patches".

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Patch 5.4 Siege of Orgrimmar

Patch notes	Release (US)	Version	Interface	Highlights & notes
Patch 5.4.0	10 September 2013	17359	50400	New Raid: Siege of Orgrimmar Flexible Raid Difficulty Timeless Isle Proving Grounds Connected Realms
Patch 5.4.0hotfix1	13 September 2013	17371	50400	Unknown bug fixes
Patch 5.4.0hotfix2	24 September 2013	17399	50400	Unknown bug fixes
Patch 5.4.1	26 October 2013	17538	50400	BlizzCon 2013 pets New RaF mount Asia-only pets? Unknown bug fixes
Patch 5.4.2	10 December 2013	17658	50400	Mail account-bound items across realms In-game shop Improved cross-realm raid finder Treasure Goblin pet? Bug fixes
Patch 5.4.2hotfix1	18 December 2013	17688	50400	Unknown bug fixes.
Patch 5.4.7	PTR as of 6 Feb 2014	17859 / 17898	50400	Level 90 boost UI? PvP changes Boost of Timeless Isle ilvl from 476 to 489

Patch notes	Release (US)	Version	Interface	Highlights & notes
Patch 5.3.0	21 May 2013	16977 / 16981	50300	New Battleground: Deepwind Gorge New Arena: The Tiger's Peak New Scenarios: Battle on the High Seas Blood in the Snow Dark Heart of Pandaria The Secrets of Ragefire Heroic Scenarios Quest Campaign: Escalation XP needed for level 85 - 90 reduced by 33%.
Patch 5.3.0hotfix1	22 May 2013	16983	50300	Unknown bug fixes
Patch 5.3.0hotfix2	23 May 2013	16992	50300	Unknown bug fixes
Patch 5.3.0hotfix3	11 June 2013	17055	50300	Unknown bug fixes
Patch 5.3.0hotfix4	26 June 2013	17116	50300	Unknown bug fixes
Patch 5.3.0a	29 June 2013	17128	50300	Unknown bug fixes for Korean client

Patch notes	Release (US)	Version	Interface	Highlights & notes
Patch 5.2.0	5 March 2013	16650	50200	New Daily Quest Hub: The Isle of Thunder. New Raid: Throne of Thunder Legendary Quest continues New World Bosses: Nalak, the Storm Lord Oondasta New World Boss System New scenarios Sunsong Ranch farming improvements
Patch 5.2.0a	8 March 2013	16669	50200	Unknown bug fixes
Patch 5.2.0b	11 March 2013	16683	50200	Unknown bug fixes
Patch 5.2.0c	12 March 2013	16685	50200	Unknown bug fixes
Patch 5.2.0d	14 March 2013	16701	50200	Unknown bug fixes
Patch 5.2.0e	14 March 2013	16709	50200	Unknown bug fixes
Patch 5.2.0f	18 March 2013	16716	50200	Unknown bug fixes
Patch 5.2.0g	20 March 2013	16733	50200	Unknown bug fixes
Patch 5.2.0h	25 March 2013	16760	50200	Unknown bug fixes
Patch 5.2.0i	25 March 2013	16769	50200	Unknown bug fixes
Patch 5.2.0j	9 April 2013	16826	50200	Unknown bug fixes

Patch notes	Release (US)	Version	Interface	Highlights & notes
Patch 5.1.0	27 November 2012	16309	50100	New world PvP conflict and factions Brawler's Guild Item Level Upgrades Battle pet upgrade system New scenarios
Patch 5.1.0A	10 December 2012	16357	50100	Bug fixes

Patch notes	Release (US)	Version	Interface	Highlights & notes
Patch 5.0.4	28 August 2012	16016	50001	Has official patch notes. Pre-launch system patch version. See Patch 5.0.4...
Patch 5.0.5	13 September 2012	16057	50001	Has official patch notes. Pre-launch system patch version and expansion (enabled 25-Sep-2012). See Patch 5.0.5...
Patch 5.0.5b	10 October 2012	16135	50001	Bug fixes

Patch notes	Release (US)	Version	Interface	Highlights & notes
β Patch 5.0.1	Beta	15640 - 15851	50000	May never be released on a live server. See Patch 5.0.1...
β Patch 5.0.3	Beta / Test	15851 - 15882	50000	May never be released on a live server. See Patch 5.0.3...
β Patch 5.0.4	Beta / Test	15913 - 16016 so far	50001	Has official patch notes. Announced as pre-launch system patch version. See Patch 5.0.4...