Initial work on KOffice development began in 1997 with KPresenter, followed by KWord in 1998. In 2010, the KOffice community decided to rename the suite to Calligra Suite to reflect the presence of both productivity as well as creativity applications. The core engine of Calligra is used both for desktop as for mobile applications.
In 1999, KOffice was cited in testimony in the United States v. Microsoft anti-trust trial by then-Microsoft executive Paul Maritz as evidence of competition in the operating system and office suite arena.The first official release of the KOffice suite was in 2000 when it was released as part of KDE 2.0. Versions 1.1 followed in 2001, 1.2 in 2002.
KOffice has undergone a major transition in recent years as part of the release of KDE SC 4. Coinciding with the work on KDE SC 4, the KOffice team prepared a major new release, KOffice 2 which used the new KDE SC 4 libraries. Although version 2.0 was released in 2009, the release was labelled as a “platform release” which was recommended only for testers and developers, rather than production use, since the release was missing key features and applications from the previous stable release series.
This continued with version 2.1 in November, 2009. Regular end-users requiring a stable environment are still recommended by developers to use the stable 1.6 release series. In May 2010, version 2.2.0 was released and brings an unprecedented number of new features and bugfixes. Kexi was integrated again. Flow has not yet been migrated. A new framework for effects on shapes and a new import filters for the Microsoft XML based office formats that are used in MS Office 2007 and later got added.