In a resounding victory for Microsoft Corp., bills seeking to mandate the use of open document formats by government agencies have been defeated in five states, and only a much-watered-down version of such legislation was signed into law in a sixth state.

The proposed bills would have required state agencies to use freely available and interoperable file formats, such as the Open Document Format (ODF) for Office Applications, instead of Microsoft Corp.'s proprietary Office formats. The legislation was heavily backed by supporters of ODF such as IBM, which uses the file format in its Notes 8 software, and Sun Microsystems Inc., which sells the ODF-compliant StarOffice desktop application suite.