I noticed that update with Yahoo recently myself. My opinion as far as Yahoo goes is, I think they might be in competition with Google and their gmail accounts offering so much mail storage... Up til now runbox and gmail and maybe some others, offered more storage than Yahoo...
Competition or not, I still think that it is a genuinely scary scenario that the internet should now offer us UNLIMITED storage for all our emails, pictures, video files, documents.....
Maybe I'm worrying about nothing?.....Maybe I should just 'get a life'....