no Calendar and Tasks in the left side

Hello. I have lost my calendar and task in the left bar. Till now they were listed in the left side under Mail and Contacts

Hello Kirsten,

Could you please right-click on the Mail heading in the left pane and make sure you have Calendar and Tasks selected?

Thank you,

Thanks a lot. I had tried to right-click, but not on the mail-heading. Now I see them again. Best regards Kirsten