Nobody has invested more to defeat Microsoft Corp.'s Open XML document format than IBM Corp.

So why is IBM supporting Open XML in a handful of its products?

According to technical documentation on IBM's own Web sites, Big Blue already supports Open XML, the native file format of Microsoft Office 2007, in at least four of its software.

However, Microsoft Office users interested in testing or switching to Lotus Symphony, IBM's upcoming challenger to Office, may be disheartened by signs that IBM won't budge from its stance that it will only support documents created in Office 2003 and prior versions.

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IBM, Lotus, Lotus Notes, Domino, Lotusphere, Lotus Symphony, Microsoft, OOXML, Open Office, XML, Document, File Formart, Support