I suspect this was the crux of the matter
Ms. Greene was fired after she refused to resign or take another position at VMware, according to a VMware manager who asked not to be named because he was not authorized to speak publicly.
The point of conflict, the person said, was that Ms. Greene had been pushing hard for VMware to be spun off early next year. After five years of ownership, a subsidiary can be sold off in an essentially tax-free transaction. EMC bought VMware for $635 million in cash in December 2003.