Recently 4 days of emails disappeared from my Yahoo account on my LAPTOP. Interestingly, they still appeared on my iPad. A Yahoo tech helped me restore them on my laptop by clicking on 'unread messages' (no matter that they were, in fact, already read). That 'fix' lasted two days and then the emails disappeared from both my laptop and iPad.
I've contacted Yahoo and their response is: "According to our records, it appears an IMAP client may have deleted your messages..... Once a message has been deleted by an IMAP client, it's removed from your Yahoo! Mail account. Messages deleted by a mobile device are not recoverable."
Any thoughts? This is disconcerting to understate my concerns.