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The utilities from libdb-utils conflicts with same tools from db4-utils causing that packages (like cyrus-imapd) requiring libdb-utils can't be installed because db4-utils are always(?) installed. Such kind of conflicts is disallowed and has serious consequences.
The same problem with openldap-servers on F17.
This is now fixed in rawhide. I renamed the db_* utilities from db4-utils to db4_* so that we shouldn't have any file conflicts any more.