The departure of Bertrand Serlet from Apple is being done on good terms, sources claim. Until today, Serlet was the company's senior VP of Mac software engineering. Officially the executive has said he is leaving to "focus less on products and more on science;" in any case he is just moving on, the sources contend. "ThereĆs no acrimony there," one of the sources explains, describing the transition as simply a "changing of the guard."