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In classic Outlook, select File > Options > Language.
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In the Office display language section, select your preferred language and then select Set as Preferred.
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Select OK to save your changes.
To change the proofing language, in the Office authoring languages and proofing section, select Add a Language.
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In new Outlook, on the View tab, select
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Select General > Language and Time.
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Under Language, open the list and choose a different language.
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Set or clear Rename default folders so their names match the specified language, and select Save. (The default folders are Inbox, Calendar, Sent Items, and so on.)
