The simplest way to find out is to set up a new Mail.app account that mirrors your existing POP3 account and select IMAP as the connection method. It either works or it doesn't! For the most part, the only thing you have to change to go to IMAP is the connection method, from POP3 to IMAP. Try it and see! I have discovered unadvertised IMAP in a place or two using this very method.
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