Steve Ballmer presided over the launch of the much-loathed Windows 8, over the move into manufacturing tablets which cost it a $1 billion write-down of unsold stock earlier this month and over the deal with Nokia on hand-sets which has not done much to save the floundering Finns.
Making tablets annoyed many of Microsoft's hardware manufacturing customers, and porting Windows to ARM annoyed Microsoft's long-time ally Intel.
Ballmer has behaved very oddly in public bouncing around and shouting in his presentations which can be watched on YouTube.
He met Bill Gates at Harvard and became Microsoft's 30th employee in 1980.
He is worth $15 billion.