Send an Outlook calendar in an email message - Microsoft Support
https://support.microsoft.com/en-us/office/send-an-outlook-calendar-in-an-email-message-51ecca41-8fb1-48af-9383-b12e1c0d5512
WEBOffice 2016 - 2019. On the Home tab, select New Email. Type your message, then put the cursor where you want to insert the calendar info. Go to Insert > Calendar. If you don't see Calendar on the Insert tab, on the right end of that tab, select More commands, then, under Include, select Calendar.
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