CalDAV & CardDAV on iCloud

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To my knowledge, EM Client is the only Windows-based email program that support these. My sincere gratitude for including this functionality.

For any others trying to add this, the URLs that worked for me are:

https://p04-contacts.icloud.com:443/
https://p04-caldav.icloud.com:443/

Of course, you need to enter your iCloud user and password in the space provided.

I did notice, however, when trying to update a contact or calendar entry, it creates a duplicate entry locally. If you try to delete the original, it errors out with a "Precondition failed" error.

I'm not even sure that this is EM Client's fault, or if Apple has implemented the protocol incorrectly.

In any event, is there a way to subscribe in a read-only mode, to prevent unintended updates to iCloud entries?