User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0 Build ID: 20121010144125 Steps to reproduce: New laptop, newly downloaded Thunderbird and set it up to get messages from a gmail account.... Actual results: However, even after letting TB stay open for over 24hrs without interruption it is still continuously re-downloading my 17,000+ emails from the server....AND restarts the process from the beginning the moment I open a new email in my inbox! This is making the program run very slowly. Please help! Expected results: Only new emails should be getting downloaded after the initial setup, I believe.