Looks like Yahoo is trying to beat Google to the finish line by giving their users Unlimited Email storage. This is great news only if my Yahoo account wasn't constantly hit with spam. Google's filtering seems to be much more comprehensive. Yahoo does offer some filtering in addition to their own spam filters, but I have already filled up the rules that you can apply (I think that there were only 10 or 12 spots for rules you can set).

What Yahoo and Google need to do is remove the restriction on the file attachments. I would love to use both Google and Yahoo for more file storage, but with the limits it is kind of hard to do. They could warn you if you were sending it to a user outside of Gmail or Yahoo, but you should have the ability to attach a 100mb file. They either need to do that or offer some kind of file storage area for files.

http://yodel.yahoo.com/2007/03/27/yahoo-mail-goes-to-infinity-and-beyond/