This paper quantifies hidden costs and operational risks associated with moving from GroupWise to Exchange. Page 1 highlights total migration costs for a 5,000-user organization exceeding US$2.7 million, excluding licensing. It details additional expenses in hardware, admin training, end-user training, coexistence tools, migration utilities, and consulting. Tables show dramatic increases in licensing complexity and storage requirements, while diagrams emphasize Exchange’s multi-copy message store inefficiency. The paper stresses operational disruptions, elevated helpdesk demand, and long-term overhead compared to GroupWise’s simpler, more cost-effective architecture.

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