A week after formally joining the effort to develop the productivity applications OpenOffice.org, IBM Tuesday released into beta its own implementation called IBM Lotus Symphony and took direct aim at Microsoft Office.

IBM is making the suite of document, spreadsheet and presentation applications available free, and hopes to attract business, academic, government and consumer users. The company has not announced a ship date for a final release of Symphony, which is based on OpenOffice.org 1.2.

But identical versions of the applications are shipping as embedded tools in Notes 8, which was released last month.

IBM Lotus already has a suite of productivity tools called SmartSuite, but the company has not made any investment around the tools in the past few years and doesn’t plan to start now, according to company officials.

“Symphony editors are the strategic investment going forward,” said Ed Brill, business unit executive for worldwide sales at IBM/Lotus. “We are providing import filter capabilities so SmartSuite files can be brought into the Symphony editors and be carried forward with formats like Open Document.”

IBM has been a vocal supporter of Open Document Format and a nagging critic of Microsoft/Ecma’s competing OpenXML format, which neglected to get the stamp of standardization from the ISO two week’s ago.

IBM’s timing for its renewed push into the productivity applications market is no coincidence, and it puts IBM on the front lines to battle Microsoft Office along with Google, Sun and others offering free, open source and hosted options on collaboration tool sets that include productivity applications and options for integration with business workflows and applications.

IBM’s announcement comes a day after Yahoo bought Zimbra’s collection of open source collaboration tools for $350 million and said it would target university, business and ISP markets. Zimbra is foremost an e-mail platform, but its collaboration suite includes text-editing capabilities.

IBM’s Symphony is made up of Lotus Symphony Documents, Lotus Symphony Spreadsheets and Lotus Symphony Presentations. The same core applications found in Microsoft Office and suites from Google, Sun, which is also based on OpenOffice.org, and others, such as Zoho.