Apple's retail chief, Angela Ahrendts, is leaving (AAPL)

Apple's head of retail, Angela Ahrendts, is leaving the company. She'll be replaced by Deirdre O'Brien, who also heads up human resources.  Over the five years she worked at Apple, Ahrendts spearheaded a major redesign of the company stores.  Apple's head of retail, Angela Ahrendts, is leaving the company after a five-year run, a surprise change that raised questions about the company's plans for the network of roughly 500 retail stores considered vital to its sales and...