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Although Microsoft Office document formats are the most widely used, OpenDocument has emerged as an alternative with significant vendor backing and with high-profile government customers in Massachusetts and Belgium. OpenDocument is an XML-based format developed under the standards group OASIS, or the Organization for the Advancement of Structured Information Standards. The decision to manage the project is something of a reversal for Microsoft. Until now, it said that it would not natively support OpenDocument in Office, citing lack of demand. Instead, it would rely instead on third parties for format translators.