I use Yahoo extensively and have thousands of emails there which I need to keep.

It seems if I use Zimbra desktop and then archive emails they'll be exported from Zimbra into some archival format and then be deleted from Yahoo's server. Is this right?

If so it's not what I want. I want them to remain on Yahoo as long as ever Yahoo will keep them.

And I want them on my pc. Belt and braces, that's me.

How can I get this?