This update to MozillaThunderbird 52.1.1 fixes the following issues:

- fixed crash when compacting IMAP folder (boo#1038753)
- Some attachments could not be opened or saved if the message body is empty
- Unable to load full message via POP if message was downloaded partially (or only headers) before
- Large attachments may not be shown or saved correctly if the message is stored in an IMAP folder
  which is not synchronized for offline use