How to change the default language in …
https://www.extendoffice.com/documents/outlook/2372-outlook-change-default-language.html
How to Change the Language on Outlook 2007 Open Outlook and create a new email by clicking the File > New > Mail Message. In the Message window, click the Office Button at the upper-left corner > Editor Options. In the Editor Options dialog box, click the Popular in the left bar, and then click the Language Settings button. Choose the language you want to use and click OK. Create a new email with clicking the File > New > Mail Message. In the Message window, click the Office Button at the upper-left corner > Editor Options. In the Editor Options dialog box, click the Popular in the left bar, and then click the Language Settings button. ... Go to Settings > General > Language and time or Region and time zone. Select the language, date format, time format, and time zone you want to use.
Open Outlook and create a new email by clicking the File > New > Mail Message.
In the Message window, click the Office Button at the upper-left corner > Editor Options.
In the Editor Options dialog box, click the Popular in the left bar, and then click the Language Settings button.
Choose the language you want to use and click OK.
Create a new email with clicking the File > New > Mail Message.
In the Message window, click the Office Button at the upper-left corner > Editor Options.
In the Editor Options dialog box, click the Popular in the left bar, and then click the Language Settings button. ...
Go to Settings > General > Language and time or Region and time zone.
Select the language, date format, time format, and time zone you want to use.
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