Steps to Rebuild the Global Database
Locate the global-messages-db.sqlite file in your Thunderbird Profile .
Delete the global-messages-db.sqlite file.
Start Thunderbird. The re-indexing process will start automatically. Depending on the number of messages, it might take some time for the indexing to complete. You can continue to use Thunderbird, but performance might be affected and search will return only partial results or even no results until the indexing is complete. The indexing progress can be monitored through the Tools | Activity Manager menu.
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