Hi @Anonymous ,
I want to confirm with you the steps to change the display language:
- Go to File > Options > Language.
- Under Office display Language.
- Select the language you want, and then select Set as Preferred. (If the language you want is not listed, select Add language to install additional display languages or download the proper Language Accessory Pack for the language you want to use from this page: Language Accessory Pack for Office.)
- Then restart Outlook.
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