Favorite Mailboxes Disappear from view

Unfortunately the Outlook app does not notify about mails in subfolders that come from rules. In addition it rarely refreshes the unread mail count on subfolders. It makes it too difficult for me to use rules. Since all my folders are based on rules and the Outlook app does not support it by notifying you when there is a mail message it becomes useless to me. Setting up the favorite mailboxes along with setting those folders as push folders makes the iOS mail app far more functional than the Outlook map but the fundamental problem is that all those folders that are marked as push folders and then I add them as favorite folders periodically disappear.