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I run the latest version of the free edition on a Windows Server 2003/IIS6. All works fine, except caldav. It's really strange! I try to sync my Galaxy Tab 3 and a Lumia phone.
No problems with carddav! Both devices are syncing in both directions perfectly.
If I create an appointment on the devices I can see it with the Smartermail web interface. But if I create appointments with the web interface they will not synced!
I can see some 401 codes in the IIS logs while doing a PROPFIND method!
I spend hours to solve the problem. No success. I don't have any ideas.
Hope you can help me!