OpenDoc Society maintains an extensive list of ODF software libraries for OpenDocument Format.
[63][64][65][66] As an answer, on 20 October 2005 an online petition was created to demand ODF support from Microsoft.
The goal of project is not to implement ODF direct to Microsoft Office, but only to create plugin and external tools.
Independent analysis has, however, reported several concerns with these plugins, including lack of support for Office 2007.
[81] Sun Microsystems' ODF Plugin for Microsoft Office users[82] (download link no longer available as of 30 March 2013)— was a plugin that allowed users to read and edit ISO-standard Open Document Format (ODF) files in Microsoft Office.
[83][84] ooo-word-filter[85] was a plugin that allowed users to open ODF files in Microsoft Office 2003.
OpenOpenOffice was developed by Phase-n, a free and open source software plug-in to enable Microsoft Office to read and write OpenDocument files (and any other formats supported by OpenOffice.org).
They also argue that this approach significantly simplifies maintenance; when a new version of OpenOffice is released, only the server needs to be upgraded.
[90] The current implementation faces criticism for not supporting encrypted documents and formula format in the same way as other OpenDocument compatible software, as well as for stripping out formulas in imported spreadsheets created by other OpenDocument compatible software.
[91][92] Critics say that with this conflict of standards Microsoft actually managed to reduce interoperability between office productivity software.
Peter Amstein and the Microsoft Office team are reluctant to make liberal use of extension mechanisms, even though provided in ODF 1.1.
[96] Before SP2, Microsoft had sponsored the creation of the Open XML translator[80] project to allow the conversion of documents between OOXML and OpenDocument.
Sun Microsystems has created the competing OpenDocument plugin for Microsoft Office 2007 (Service Pack 1 or higher), 2000, XP, and 2003 that supports Word, Excel, and PowerPoint documents.