Microsoft is trying to make it easier for customers to
use their file format of choice
Although the Microsoft Office OOXML format has been
ratified by both the ECMA and ISO standards bodies,
Microsoft is still expanding its coverage of file formats.
With a Service Pack next year, this will extend to ODF 1.1
(which is not an ISO standard, but is a market standard),
Adobe's PDF 1.5 and the archivally-oriented PDF/A. (Office
support for PDF is currently via a download because,
hypocritical