New email is not being synced consistently for my Exchange 2013 mailbox via IMAP Forcing Thunderbird to check for new email shows no new email. If I restart Thunderbird I will get the latest email, also if I force Thunderbird offline (little computer screen icon on the bottom right) then go back online I will also be able to receive new email. If I leave Thunderbird after some amount of time (hours) I will get updated email. Behaviour happens using Linux/Thuderbird latest version as well as Windows 8.1/Thunderbird lastest version. Suggestions? Thanks John