The chairman of the portugese standardization organization said that there was no place in the working group on ISO/IEC DIS 29500 (OOXML). Using this reasoning, IBM and Sun Microsystems were refused seats in the technical committee.
Both IBM and Sun are big and important players in the information technology sector. Their importance for the market is about comparable to that of Microsoft. However, both Sun and IBM are currently pushing for the existing ISO standard 26300 (Open Document Format), which is used in a lot of free software products, such as OpenOffice.org, Star Office, KOffice and related suites.
The committee however is now crowded with Microsoft (3 seats) and Microsoft Gold Partners.