I am using Windows Live Mail 2012 on Windows 7. I am connecting to a ymail account using IMAP. It used to show all of my Inbox emails but lately it has only been showing 200 messages. It always shows the oldest 200; all new email is displayed for the day that it was received on, but the next day it 'disappears'. If I log on to the ymail web client it shows all emails and if I connect using Thunderbird it also shows all emails. Has anyone got any ideas as to what is causing this.

Other email accounts that I connect to work fine (POP).