Hello, I test the em client on a Kerio server I constantly get the error message when syncing:

it has already been partially syncronized but at some point syncronisation stops.
Ein Fehler ist aufgetreten:
Die Syncronisation des Ordner …/Posteingang/ ist fehlgeschlagen mit folgendem Fehler:
An element node ́soap: Header ́of the type Element was expected, but node “Body” of the type Element was found. 

Hello MR,

thank you for contacting us and for reporting the problem. The error message indicates it is a server sided problem so I recommend you to contact your mail service provider and report them the issue. I am sure they will be able to advise you and resolve the problem.