For the moment, eM Client indicate only the number of message for all account (first line). How to have this information of number of awaiting message for each mail account ?
If you click on any account Inbox, the unread/total will display in the title bar.
You can also right-click on any folder and choose Properties. That will show the total messages in that folder and any sub-folders.
(screenshots are from the beta, but are practically the same as version 7.x)