'''Some troubleshooting options''' Rebuild the Global Database 1. Quit Thunderbird. 2. Locate the ''global-messages-db.sqlite'' file in your Thunderbird Profile. 3. Delete the ''global-messages-db.sqlite'' file. 4. Start Thunderbird. The re-indexing process will start automatically. https://support.mozilla.org/en-US/kb/compacting-folders https://wiki.mozilla.org/Thunderbird:Testing:Memory_Usage_Problems 🔵 Verify disk integrity (in your OS) 🔵 '''Check Tools | Developer Tools | Error Console''' for possibly-relevant messages