For background, I've refreshed the links, changed webcals to webcal / http, deleted the calendar from iCloud and set it up again, etc. Basically I've tried everything and I still get these errors;

When entering 'webcal' - There was an error subscribing to the calendar. The server is currently unreachable or its name (cid-b7f54d723e976b04.calendar.live.com) is incorrect.

When entering 'http' - There was an error subscribing to the calendar. The server is currently unreachable or its name (cid-b7f54d723e976b04.calendar.live.com) is incorrect.

I'm not sure what else to do, nothing works!!! Hope someone can help.

Cheers,

Michael