Are there any known problems in the current infrastructure that might adversely affect the migration project?
Beware of overtaxing existing connections, transmission problems due to inadequate software components and inefficient or incorrect message routing. For example, bottlenecks or malfunctioning connectors are the likely cause when messages are queued on a bridgehead server. Non-delivery reports (NDRs) are signs of incorrect message routing. Message loops, another common problem, are created if messages are routed multiple times through the same bridgehead. Exchange Server 2003 adds trace information to all transferred messages to detect message loops and drop looping messages with a non-delivery report (NDR). However, if the message’s path includes multiple messaging systems the trace information might be lost during message conversion between the systems. In this situation, it is possible for messages to loop indefinitely. The effect can be similar to that of an e-mail flood caused by a worm or virus. Therefore, you should review the existing messaging topology carefully to ensure that
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