I am running Windows Live Mail with Windows 8.1.  I have made no recent changes to my email setup.  (Though there are those infuriating automatic updates which reliably break something.)  Beginning five days ago, emails to my IMAP account could not be seen in my Live Mail inbox.  The number of unread emails indicates that I have received a new message, but when I click on the inbox, the last message displayed is five days old.  (I can see the new messages on my phone.)  I have tried searching the inbox for the missing messages and they are not found.

My work requires me to save my emails, so I cannot do anything (like uninstalling) that might delete them.  (The last time I tried to export to backup, it did not work and I lost all of my emails.  I am not willing to rely on that again.)