Here are just a few of the issues with the "New" Yahoo mail:
* Inbox Layout cannot be reduced in size any further.
* Preview Panel does not expand enough (see above) which causes messages to be cut off from side to side. *should not have to scroll from side to side to read a message.
* The Folder List is cut off so full folder names are not readable. Expand and Collapse similar to Gmail would be advisable.
*Spam folder STILL does not give a count of messages in the folder so unless you click on it you have no idea if there are messages in there or not.
* Trash folder, also, does not have a message count.