Nach langer Suche habe ich auf der IBM Seite die Rekonstruktion des Fehlers und einen Lösungsansatz gefunden. Jetzt funktioniert es, auch wenn ich Fehler, Ursache und Lösung nicht wirlich nachvollziehen kann.
Hier der IBM Text:
Problem
Using a Last Name that has different First Name variations found in the Directory Catalog (DirCat), you create a new memo and use type-ahead to perform the name lookup. In the Notes 6.5.2 client, it is working as expected and the type-ahead finds the expected names; however, you receive the ambiguous names dialog box with no suggestions in the Notes 6.5.3 client.
Steps to reproduce:
1. Replicate a local copy of the Directory Catalog and your mailfile. Make sure the Directory Catalog is sorted by Last Name.
2. Switch to a Location document (e.g., "Island" or "Home") so you are disconnected from the network.
3. Select File -> Preferences -> User Preferences -> Mail . Add the filename of the local replica of the Directory Catalog to the "Local address books" field.
4. Create a new Memo.
5. In the "To:" field, type in a user's Last Name and the first few initials of their first name. For example, to search for John Doe you would type "Doe Jo" (without the quotes).
6. Press the F9 key.
o In the 6.5.2 client, the type-ahead completes and the name displays as expected.
o In the 6.5.3 client, the ambiguous names dialog is displayed containing no suggestions. This is not what is expected.
7. If you click OK the "To:" field appears blank. However, if you click CANCEL or press the ESC key, the name is resolved.
8. Blank out the name (if it is not already) and type in the user's Last Name.
9. Press the F9 key. You are not presented with any name suggestions.
Cause
Solution
This issue was reported to Quality Engineering and has been addressed in Notes/Domino 6.0.5 and 6.5.4.
Excerpt from the Lotus Notes and Domino Release 6.0.5 / 6.5.4 MR fix list (available at http://www.ibm.com/developerworks/lotus):
Directory Services
* SPR# CSMH65WPRX - The Ambiguous Names dialog box did not display suggested names when using the offline Directory Catalog. This fix is addressed in the Client and Server code, depending on where the search is being done. Searching for names that were sorted by last name require a full text search in order to find the users. So, for example, in Off-line directory catalogs, when you hit F9, your search is performed on the client, because your dircat is local. If the Directory Catalog is located on the server, then the fix is on the server side because the searching will be issued against the server.
This problem was a regression introduced in 6.5.3 and has been fixed in 6.0.5 and 6.5.4.
Workarounds:
* Add another Directory Catalog that is sorted by Distinguished Name (First Name) to the local configuration (e.g., names=names, lndircat, fndircat). This will also provide for First and Last Name addressing.
OR
* When the "No Match" dialog appears, click the CANCEL button or press the ESC key. When actually sending the mail, click on "Send Anyway".
Supporting Information:
This issue can also affect Notes users who have a LAN connection and use the server-based Directory Catalog for name resolution and addressing. There is also an additional symptom of the @Domain not being appended to the recipient's name, which can result in a message delivery failure.