Has OpenDocument been tested?

OpenDocument has been well tested. The OASIS Standard is already implemented by several office applications, and some of these applications use it as native file format. Furthermore, OpenDocument is based on the OpenOffice.org XML file format, which has been the default file format of the OpenOffice.org application since 2001. This includes the word processor, the spreadsheet, and the presentation applications of OpenOffice.org.

For more information, see OpenDocument milestones.