Hello,for internal matters of the company, it will migrate all the mailboxes that are currently connected via MAPI to the Exchange Server 2003 SP2 to POP3. What recommendations should I consider?, A special setting for POP3?. I'm talking about 300 mailboxes.Thank you.

Do you mean to use POP3 protocol to connect mailboxes on the exchange server, instead of MAPI? The message handling will be different when you use POP3 (Reference)The resources below may help:Introduction to e-mail account typesConfiguring and Comparing the POP3 Service in Exchange Server 2003 and Windows Server 2003James Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx)If you have any feedback on our support, please contact tngfb@microsoft.com