Michael Dell returned to the company as CEO in 2007 after a brief hiatus, but has been unable to engineer a turnaround thus far. Dell's focus on corporate computing in recent years has yet to yield results, critics note. Competing successfully against incumbents, including IBM and Hewlett-Packard, will not be easy no matter what the corporate structure. A source earlier said that Dell had slashed its internal forecast for fiscal 2013 operating profit to about $3 billion - down sharply from the $3.7 billion it had predicted previously. The source added that more details will be revealed in a proxy filing which is expected by the end of this week. Meanwhile, if the special committee of the board decides that either - or both - of the rival bids for Dell are reasonably likely to lead to superior offers, Icahn and Blackstone will have to present firm bids for Dell. The negotiations are likely to take weeks, the source said.