The User tries to search for a contact with their name or firstname but no results can be shown. The fieldmapping in the XPhone Connect Directory is configured properly though. This happens because the Service "SQL Full-text Filter Daemon Launch Service" doesn't start. It can't start since the Serviceaccount "NT Service" doesn't have the needed rights to do so.
To solve this issue, open the System Control and search for the Service "SQL Full-text Filter Daemon Launch Service (...)". Doubleclick it and navigate to the tab "Login". Choose "Local Systemaccount" here.
After that, start the Service and refresh the Index for every set datasources in the XPhone Connect Directory.