Tim Bray, the writer of XML, wrote in his blog on Thursday that
Microsoft pushed for its Office Open XML (OOXML) standard to be
accredited by the International Organization for Standardization (ISO)
so that the software giant could use the accreditation as a "marketing
tool".

http://news.zdnet.co.uk/software/0,1...9388227,00.htm

'There has been a substantial amount of cleanup of things that were
specified in an ugly or broken or stupid way in ECMA-376 .. We need a
name to talk about this new stuff; let’s call it “The ISO Delta”'

"The important thing is this: The ISO Delta is completely irrelevant
to the marketplace. It is not implemented in the shipping Microsoft
products"

http://www.tbray.org/ongoing/When/200x/2008/04/15/OOXML