Mail 5.1
Known Issues
•Inconsistent issues with missing folders from folder structure, messages displaying no content and/or garbled text.
Solutions or Workarounds
•Deleting the following files may resolve the issue ~/Library/Mail/V2/MailData/Envelope Index-wal, Envelop Index-shm, Envelop Index.  Relaunch Mail and allow it to recreate the Envelope Index Files.
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