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Compact Thunderbird Folders

[OLD] Compact Folders in Thunderbird to improve performance and reliability

To compact folders manually:
  1. Open Thunderbird.
  2. Select Compact Folders from the File menu.
  3. Wait for the folders to compact.


To compact folders automatically (recommended):
  1. Open Thunderbird.
  2. Go to Tools > Options > Advanced > Network & Disk Space > Disk Space.
  3. Set Thunderbird to "Compact folder when it will save over 100 kB".
  4. Click OK.

More information about compacting folders in Thunderbird is available here: