According to Brian, the format is open, comprehensive, and backward compatible - how could there be bad news? Well, as they say in Monty Python's The Holy Grail, "It's very nice-a, but we already got one." As Tim Bray notes, many of the other heavyweights (including Adobe - how did that not get picked up more widely?) in the technology industry have been collaborating on just such an XML based, open format referred to with the unexciting but descriptive moniker Open Document Format.
The question then becomes why did Microsoft invest its time and energy into creating a duplicate format? While conventional wisdom might have us believe that it's because big bad Redmond is all about lock-in, the open nature of the format undermines that argument.
When asked why Microsoft did not use the OASIS (Organization for the Advancement of Structured Information Standards) OpenOffice.org XML file format, Paoli answered, "Sun standardized their own. We could have used a format from others and shoehorned in functionality, but our design needs to be different because we have 400 million legacy users. Moving 400 million users to XML is a complex problem."
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Read More:
Tecosystems (weblog by stephen o'grady)
Source:
ZDNet
More about the MS Office XML format:
Brian Jones's Blog