While reading the news at the Pro-Exchange site, I noticed this interesting webcast:

RIM to Windows Mobile Migration (Level 100)
Thursday, March 27, 2008 9:00 AM Pacific Time (US & Canada)
Patrick Salmon, Mobility Architect, Enterprise Mobile

Event Overview
Increasing mobile worker productivity is a primary driver for why organizations are re-examining their mobility strategy. The Windows Mobile infrastructure provides greater opportunity for enterprises to drive productivity among their mobile workers with the deployment of line-of-business (LOB) applications providing quick and easy access to information to address their business requirements. Additionally, scalability and lower costs are key factors in considering migrating from Research in Motion (RIM) to a Windows Mobile infrastructure. Windows Mobile can easily scale to support the growth of mobile users within a Microsoft Exchange Server environment without having to acquire, install, manage, and support additional infrastructure components. For a successful RIM to Windows Mobile migration, enterprises need to understand the key factors in managing costs and developing a migration plan designed to optimize productivity.