Shared calendar could not be updated

We have just got our domain moved to the smartermail server and configured a read-only access for a specific user to another user.

We can open this shared calendar in Outlook 2013 but it shows no entries, and has a little warning:

could not be updated

The Outlook 2013 is configured with EAS ....

Any idea where the problem is?

if i try through the webinterface i have no problem!

And I found the solution, we need to add it through the web interface....

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