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== History ==
ClearCase was developed by [[Atria Software]] and first released in 1992<ref>{{cite web | url = https://web.archive.org/web/20090802071539/https://www.findarticles.com/p/articles/mi_m0SMG/is_n13_v12/ai_12606942 | title = ClearCase - Atria Software Inc.'s software configuration management system - New Products: Development Tools - Brief Article - Product Announcement | publisher = Software Magazine | date = September 15, 1992 | access-date = 2007-12-01 }}</ref> on Unix and later on [[Windows]]. Some of the Atria developers had worked on an earlier, similar system: ''DSEE'' ([[Apollo Domain|Domain]] Software Engineering Environment) from [[Apollo Computer]]. After [[Hewlett-Packard]] bought [[Apollo Computer]] in 1989, those developers left to form Atria.<ref>{{cite web | url = http://www.cmcrossroads.com/cgi-bin/cmwiki/view/CM/HistoryOfCM | title = Key dates in Hardware/Software Configuration Management History | publisher = CM Crossroads LLC | year = 2007 }}</ref><ref>{{cite web | url = https://web.archive.org/web/20090802063953/https://www.findarticles.com/p/articles/mi_m0SMG/is_n8_v15/ai_17338017 | title = Complex development earns Atria an IS role; hot Unix vendor's move to Windows and NT opens IS doors - Company Profile | author = Michael Bucken | date = August 1995 | publisher = Software Magazine }}</ref><ref>{{cite newsgroup | url = http://lists.gnu.org/archive/html/info-cvs/2004-12/msg00237.html | title = Re: cvs vs. clearcase? | author = Andrew DeFaria | date = December 21, 2004 }}</ref> Atria later merged with [[Pure Software]] to form PureAtria<ref>{{cite web | url = https://query.nytimes.com/gst/fullpage.html?res=940CE6DE1639F934A35755C0A960958260 | title = Pure Software To Buy Astria In Stock Deal<!-- original article misspells Atria in title --> | author = Lawrence M. Fisher | date = June 7, 1996 | work = The New York Times | access-date = 2007-12-01 }}</ref> in 1996. That firm was acquired by [[Rational Software]] in 1997, which was purchased by [[IBM]] in 2003.<ref>{{ cite web | url = http://www-03.ibm.com/press/us/en/pressrelease/243.wss | title = IBM Reports 2003 First-Quarter Results | date = April 14, 2003 | publisher = IBM | access-date = 2008-01-09 }}</ref> IBM continues to develop and market ClearCase. In September 2016, IBM announced a
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