how do i add holidays to my office 365 Calendar?

Depends on the type of mail account, and maybe priveder, IMAP, Pop, exchange?

Hello Vicky, Greetings! Thank you for reaching out to this forum. As a fellow Microsoft user, I'm here and ready to help you out today. When you first use Outlook, there aren't any holidays on the Calendar. But you can add holidays for one or more countries. Could you please let us know for which country are you trying to add? Try below steps, 1. Click File > Options > Calendar. 2. Under Calendar options, click Add Holidays. 3. Check the box for each country whose holidays you want to add to your calendar, and then click OK If you have a work or school account in Microsoft 365, you can subscribe to a holidays calendar using Outlook on the web and receive automatic updates when holidays are added or changed Hope this information would be useful to you. Please feel free to get back if you need any additional info. Thank you! Ravikumar Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.