Quick and dirty translation of the summary:
Microsoft offered extra 'market subsidies' to partners that participated in the Monday vote about the Open XML format. This appears from internal communication that CS has seen. 'It was badly formulated and would never have gone out' says the business area chief of the company, Klas Hammar.Update: a partial English story is available at OS2 World.
Update 14:18: Groklaw also has a story.