Internet Calenders 403 forbidden

On starting the client I always get the errors:

I don’t use any calender, I just wanna use emClient for E-Mails. Is there a way to deactivate the calender function?

Thanks

You can delete the calendar, then shouldn’t get the error.

Open the Calendar tab, and delete the calendar listed Under Internet Calendars by right-click and Delete.

Thanks a lot!