How to add a shared calendar in mail office 365.

The instructions are somewhat different depending on what email client app you are using. When you say "office 365 mail" that doesn't tell us what email client app you are using to read your email and look at your contacts and calendar. "Office 365" is who is hosting the mail server, but you can use any email client to read and manage your emails, contacts and calendars. But maybe I can help you to determine which client you are using, then one of us can come up with the steps you are looking for.

If you are using Office 365 you can either install Office on your PC or Mac, which would mean that you would end up using Outlook as your email client. Or, you could check your email at the Office 365 portal, which would mean that you would be using their hosted, web-based client at Microsoft.

Can you tell us which client you are using?

Outlook.

Thanks. This worked fine.