Omnichannel services continue to change the offers that retailers provide and the ways that consumers buy. The demands on retailers are changing in lockstep. Even as eCommerce sales grow, retailers must adjust to shrinking margins and customers' cherry picking the best deals. Mobile's growing influence also affects consumer web and in-store sales, even when buyers are physically browsing the aisles of retailers. This report explores the shifting retail foundations for digital business professionals and outlines how innovative firms can thrive amid these challenges. This is an update of a previously published report; Forrester reviews and revises it periodically for continued relevance and accuracy.