Ridiculous Search Results with WDS3.0

Hi,

WDS 3.0 gives me absolutely ridiculous results when searching outlook 2007
contacts stored in my exchange mailbox.
For example when i search for "kundenberater", a string that appears only in
the notes of 1 contact, wds returns every contact that contains the string
"kunden" anywhere in the datafields.
But - as long as I only type "kundenberate" that´s witout the last character
- search results only show the right contact.
Actually putting the search string in "" does not change anything at all.
I also rebuilt the index but to no avail.

In my opinion such behaviour renders WDS totally useless!

Any ideas?

P.S.:
In case somebody wants to know the setting is:
Outlook 2007 (german)
- Mailbox is stored on Exchange Server 2003 SP2
- Cache Mode is enabled
WDS3.0 (german)