You really should take advantage of the global search index feature of Thunderbird. It's possible that your index is corrupt, too large and so may not be funct

You really should take advantage of the global search index feature of Thunderbird. It's possible that your index is corrupt, too large and so may not be functioning correctly. You can rebuild it by following the steps here: https://support.mozilla.org/en-US/kb/rebuilding-global-database https://support.mozilla.org/en-US/kb/rebuilding-global-datab...