OSX - Move all POP Sent Items to IMAP

One of my friend is using her macbook for work, 10.9 or 10.10 using the builtin MacMail, to begin with he set up a POP3 account, but soon told he will have to use IMAP instead as they don't run any Exchange or mail server inhouse.
But by now he had already populated the POP3 account and even after setting up the IMAP, he (without knowing) still uses POP3 to collect and sent, while the IMAP has a copy of the Inbox, there is nothing in the Sent Items which the company wants to have.
Is there a simple way to move all the items in the POP3 account to the IMAP account on the same machine ? I assume that once thats done, his computer at work will have the same access to all the emails ?
Thanks for any help.
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Justin BradshawOwnerCommented:
If you're using Apple Mail, you simply have to drag the messages from the old POP based sent folder into the IMAP based version.
If you've already got them both setup, then it should be easy. Once you've got everything on IMAP that you want, you can delete the POP based account from the computer.

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CombemartinAuthor Commented:
Thank you for your help.
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