The announcement came a day before the International Organization for Standardization (ISO) is to make public the voting results.
The ISO decision will have a minimal effect on sales of Microsoft application software. Office Open XML is the default format for Microsoft Office 2007. Rather, the designation primarily affects government users, who are often required to use standards-based, rather than proprietary, software.
Opponents of the standardization effort, including
International Business Machines
, support a rival open standard, Open Document Format.
"Open XML now joins HTML, PDF and ODF as ... open document format standards," Microsoft said in a statement Tuesday. HTML is the most basic format for Web pages, and PDF was developed by
Microsoft said its Office Open XML appeared to have more than enough support from ISO voting members to win approval as a document format.
The company lost the first ISO vote by a narrow margin last September. But since that time, the company has lobbied holdouts and has taken steps
for interoperability programming with Windows products.
According to Microsoft, Office Open XML received support from 75% of voting members, well above the 66.7% required.
IBM was opposed to making OOXML a standard "because it was developed in a non-open manner, is ridiculously large
and is technically inferior" to ODF, Bob Sutor, an executive in charge of open source and standards at IBM, wrote recently on a blog.
Also on Tuesday,
The Wall Street Journal
reported that Microsoft does not intend to raise its $31-a-share bid for
. The article also noted Yahoo!'s recent road show failed to impress investors.
Microsoft was up 85 cents, or 3%, to $29.23 in recent trading.