| Feature | Condensed directory catalog (on IBM® Notes® client) | Directory assistance for secondary IBM Notes client directory, or extended directory catalog | Directory assistance for remote LDAP directory |
| Notes client mail addressing | Yes | Yes | Yes |
| Notes client LDAP-style searches | Yes | Yes | No |
| Notes client directory browsing | Yes | Yes | No |
| Notes client type-ahead addressing | Yes | Yes (if no mobile directory catalog) | No |
| Notes client F9 address resolution | Yes | Yes | No |
| LDAP client search and write operations | No | Yes | No |
| LDAP client referrals | No | No | Yes |
| Internet client authentication | No | Yes | Yes |
| Group authorization (enabled for one secondary directory only) | No | Yes | Yes |