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If you get the error message "Language was not updated to prevent an email folder name conflict" when changing language, it means that a folder has the same name as a default folder.
For example, if you try to change the language to Portuguese and receive the error, it means there is a folder named Inbox, Deleted Items, Junk Email or Sent Items in Portuguese.
To change the language, you must first delete or rename the conflicting folder before the language change can be applied.