Microsoft chooses to attack the messenger and ODF, going so far as to call for Rob Weir to step down as co-chair of the ODF Technical Committee.
You can read more about his and Microsofts ongoing efforts to delegitimate the OOXML standard on groklaw.net
Groklaw cite a former strategy paper of Microsoft which seems to be a guide for Microsoft
Our mission is to establish Microsoft’s platforms as the de facto standards throughout the computer industry…. Working behind the scenes to orchestrate “independent” praise of our technology, and damnation of the enemy’s, is a key evangelism function during the Slog. “Independent” analyst’s report should be issued, praising your technology and damning the competitors (or ignoring them). “Independent” consultants should write columns and articles, give conference presentations and moderate stacked panels, all on our behalf (and setting them up as experts in the new technology, available for just $200/hour). “Independent” academic sources should be cultivated and quoted (and research money granted). “Independent” courseware providers should start profiting from their early involvement in our technology. Every possible source of leverage should be sought and turned to our advantage.
You can read the whole strategy paper here on groklaw.net.