It's not a new sports car, but it'll have to do. In time for its 16th birthday, Yahoo Mail's getting a couple of nice tweaks, including the ability to thread conversations in its desktop, iOS and Android versions. Also on the list is one-click message deleting, starring and searching and some new mail themes drawn from curated Flickr images. Yahoo's also bringing a handful of Mail Plus features to free users, including enhanced filters, auto message forwarding and disposable address. Mail storage is also now at 1TB -- not quite unlimited, but still, not too shabby.