Hi Wouter,
Have a look at this page (below), it's likely that the messages are being left in the Example Administrator account unless something else has been specifically configured;
Call Management > Call Handlers > Messages Page > Message Recipient
Select the subscriber or public distribution list that receives messages left for this call handler. Select a recipient type from the list, then click Select.
When you select a public distribution list, each member of the list receives the call handler messages.
Default: A selected subscriber.
http://www.cisco.com/en/US/docs/voice_ip_comm/unity/405/administration/guide/ex/sag_0200.html#wp1055223
Hope this helps!
Rob