OOXML being "fully compatible" with any existing application is undeniably unreachable.
The phrase about the compatibility issues should be rephrased to be realistic.
Page vii, line 7 Part 4, Introduction
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Proposed Disposition of DIS 29500 Comment IR-0007 (Modified: 2008-01-04) Agreed; the following changes will be made to Parts 1, 3, and 4, §Introduction, page vii, line 8: The goal is to enable the implementation of the Office Open XML formats by the widest set of tools and platforms, fostering interoperability across office productivity applications and line-of-business systems, as well as to support and strengthen document archival and preservation, all in a way that is fully compatible with the large existing investments corpus of in Microsoft Office documents. Similar Comments: CA-0015 , CO-0001 , CO-0006 , GB-0127 , GR-0011 , KE-0019 , US-0272
