I'm thinking of changing service provider, i realise i wont be able to keep my openworld email address without paying a fee, but what happens to saved emails that i have put into various folders i have created on the yahoo mail page.
I assume these are stored on their server.
Will I still be able to access them after they close my account
To save all of the folders, you will have to use a mail client that can connect to the IMAP server. This will download all of the folders and the contents, so you can save them.
You old account will revert to a basic webmail account, which can only be accessed via a web browser.
If you want to download your mail, then here is one free option Thunderbird setup
Going to give the Thunderbird option a go.
Iv'e got outlook but find it wont download the individual folders, only the inbox messages.
That is why Thunderbird is set up to use IMAP, which replicates the folders.
If you need any help, then let me know.