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What do you mean by "map folders"? If you're connecting via IMAP then you should just subscribe to the folders - I don't use Versamail so that may not be how it works but it is how an IMAP client works.
Are you using VersaMail for ActiveSync or IMAP? If ActiveSync, VersaMail client doesn't support folders at all. There are other device clients can support folders, just not versamail. Thanks!