Hi there graham22june22 The only thing I can think of is that auto archiving is on and / or that you are looking at a folder that only shows unread messages. For imap accounts you should check the settings of the email account under "server" or the emails are not automatically removed from the server. The above can be a solution, but does not necessarily have to be the case. If you search for it you will see that this problem occurs more often, even with older outlook versions. Sometimes it helps above and sometimes resetting the "image" settings and / or folder options so that all mail is also visible.