In a violent outburst, Microsoft CEO Steve Ballmer vowed to "kill Google" last November, a court report claims.

Though Ballmer dismisses the event as a "gross exaggeration", the allegations are contained in a sworn statement provided to the courts as part of Microsoft's attempt to prosecute Google for hiring away senior Microsoft executive Kai Fu-Lee in July. Fu-Lee is to run Google's Chinese research centre.

Associated Press reports the event as described in a sworn declaration by a former Microsoft engineer, Mark Lucovsky, who also quit Microsoft to move to Google.

After learning Lucovsky was leaving to work at Google: "Ballmer picked up his chair and hurled it across his office", the report claims.

"Ballmer then pejoratively berated Google CEO Eric Schmidt, Lucovsky recalled.
'I'm going to f------ bury that guy, I have done it before, and I will do it again,' the declaration quotes Ballmer. 'I'm going to f------ kill Google.'"

Microsoft is accusing Fu-Lee of breach of contract.