Let's say that I have a free Yahoo account (with a 6MB limit) and now it's full and I want to still use it, but still keep all my past emails, is there an easy way to forward all that email (1000 or so of them) to another account of mine?

In the past Yahoo offered to forward emails automatically to another account, but you have to pay for that now, so thats why I don't want to do that.

Thanks for the suggestions