As reported earlier, Yahoo has started to roll out unlimited email storage to Yahoo! Mail users worldwide yesterday.
When it hits your account, you’ll notice the storage meter has disappeared — meaning, you just don’t have to worry about deleting old messages ever again!
Currently Yahoo mail is having I GB space while its competitors like GMail and Windows Live Mail are offering 2.5 GB and 2 GB respectively. Hopefully this move will help Yahoo Mail retain existing users and also get new users.
Source: Yahoo Blog