Dan Kegel - WINE architect
One of my concerns is that Microsoft reserves the right to sue you if you implement all of OOXML. The Microsoft "Open Specification Promise" and the earlier "Covenant Not To Sue" only cover the *required* portions of the standard, not the optional sections, e.g. the ones that handle backwards compatibility. Thus Microsoft seems to be saying that any OOXML file that was produced by loading a Word 2003 file and saving it as OOXML (and that's going to be the most common case for some time) cannot be legally read by a competing implementation without licensing Microsoft's patents.
Klaus Knopper - creator of Knoppix and Gnoppix
Scott Preece - Desktop Architect
I understand that the proposed standard is really a surrogate for Microsoft's claim to legitimacy in markets where support for open standards and interoperability are critical.
However, it's also true that (a) in many problem spaces there are multiple standards and (b) the normal role of the standards process is to formalize existing practice rather than to make policy or invent "better" practices. I once chaired a POSIX working group that was trying to forge a single standard to unify practice where there were two existing practices; ultimately the effort failed and the two practices were individually standardized. And the world didn't end.