Today is Document Freedom Day: Roughly 200 teams from more than 60 countries worldwide are organising local activities to raise awareness for Document Freedom and Open Standards. To support the initiatives surrounding the first day to celebrate document liberation, DFD starter packs containing a DFD flag, t-shirts and leaflets have been sent to the first 100 registered teams over the past weeks.
Open Document Format (ODF) is the first and only *Open* Standard standardised in ISO. It is supported by many applications, some of them proprietary, some of them Free Software. If you are currently using any of the applications below, your software already supports Open Document Format:
* Google Docs
* IBM Lotus Symphony
If you are not already using any of these applications, the following applications are Free Software and available for public download. Try ODF today:
Wikipedia on OpenDocument
Microsoft's promise covers only fully-compliant implementations.
But Microsoft Office isn't fully compliant with the OOXML (OfficeOpen XML) specification, therefore those who seek interoperability with Microsoft's software won't be covered by its promise.
Correction: It also doesn't cover the optional or not fully detailed parts of the specification. Almost everything is optional and far from complete in the specification.