This is correct.  You are probably using "shares" in your localsql 
configuration.  With shares enabled, you cannot force-set the prefs 
like you attempting to do since, as you found out, the default 
personal address book has a unique name for each user.  Either turn 
off share support, or leave the pref blank in the config.



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I have two address books configured in turba, localsql (the user's 
addressbook, stored in a MySQL database) and myldap, a shared, 
read-only company address book.



I added

$_prefs['search_sources'] = array ('value' => "localsql\tmyldap", ...);

to the kronolith configuration.

However, when a user logs in, only the LDAP database is searched.

The preferences only show the LDAP address book as selected, the 
user's addressbook is not selected (it is shown in the left list).



When I add the address book to the list of sources to search, and then 
query the horde_settings in the SQL database, search_sources is set to

myldap            longhexaluehere

I suppose the second value is the unique id of the user's personal 
address book.



After manually selecting the address book for the user, the address 
books are searched correctly (which is important for free/busy 
information which cannot be found otherwise).