By default, the names of the default folders will match the language of Windows. Be sure that the system language and locale are set on the desired language.
To reset the language of all Outlook folders on the Windows system language :
1. Close Outlook
2. Press windows and r on your keyboard
3. In the new window enter this command :
outlook.exe /resetfoldernames
4. Clock OK or ENTER
5. Launch Outlook
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