Modus Media Inc., which handles customer services and manages inventories for clients, including Microsoft Corp., said it plans to cut 200 jobs, or 4% of its work force, as it closes a plant in Fremont, Calif., to consolidate its North American operations. Modus Media, based in Westwood, Mass., said it will help its employees at the Fremont site find jobs in its other plants or outside the company. The plant is expected to be shuttered by September, and its work will be transferred to sites in North Carolina, Washington and Utah. The closely held company said it's also opening a plant in Guadalajara, Mexico. Modus Media, with 1999 sales of $697 million, provides customer support, inventory management, software packaging and computer assembly for companies such as AT&T Corp., Dell Computer Corp., and other technology and Internet companies.