Anṣuf ar Thunderbird n izegrar.
Rnu timahilin neɣ iɣunab nniḍen akken ad terreḍ Thunderbird d ayla-k.
MdelΓef uzegrir agi
Run the "Check for duplicates" command to see what would happen. If you're happy with the results, then run "Delete duplicates" to actually remove duplicates in your folder(s).