I have searched my ass of on google and on the FAQ here, but all issues and guides seem to refer to mobile usage. Therefore I kindly ask your help! While setting up I have used the settings that are available for mobile phones because I couldn't find any other settings. I do not have any issues with gmail calender.

The problem I have is with the new Windows 8 calendar app. I have tried to add calendar synchronization to the app. I have successfully added it in so far that I can add appointments to the calendar which do get synced to Zoho. But I only get errors messages that it cannot sync previous meetings to the calendar. 

Does anyone have any ideas what could be going on?

I have included a screenshot of the error + settings.

Thanks in advance