Using Classic Outlook on Windows for personal email, calendar, and contact management
Dear Kai_JK,
Good day! Thank you for reaching out to the community.
As a design feature, the email option should be available if you are viewing the contacts using the business card, card, phone and list view but not the people view. You can highlight multiple contacts here by holding the Ctrl key >select multiple contacts >Email. Please confirm if this is the case on your end.
Looking forward to your response.
Best Regards,
Ashraf.