I have had a Windows Live Mail (WLM ) account for years with my Cox account as a user. I also have a separate established Cox Email account. WLM is no longer supported how can I transfer my WLM folders to my Cox Email account.
You should be using a newer mail client such as Outlook or even Thunderbird mail, if you go with Thunderbird as your new mail client, I would first configure both email accounts then move forward from there.
You would be able to simply move mail between accounts once configured in Thunderbird.