-As shown the accompanying figure,you can set Outlook's default language by selecting the name of the language and then tapping or clicking the Set as Default button.

Question

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In Outlook, you can set the default language by selecting the desired language from the list of available languages and then clicking or tapping the "Set as Default" button, which applies the selected language as the default for the interface and spell check.

-As Shown the Accompanying Figure,you Can Set Outlook's Default Language