In 2006 and 2007, there was an enormous documents standards war between Microsoft, with its OpenXML documents format, and the open-source community with its Open Document Format (ODF).
In the end, Microsoft, while eventually supporting ODF, won. ODF, while still supported by such popular open-source office suites as LibreOffice and OpenOffice, became something of an after-thought.
Until, the UK government announced on Tuesday, that it will now require all official office suites to support ODF.
The document format world has just been turned upside down.