| Horde_Exception | Horde base exception class. |
| Horde_Exception_LastError | Horde exception class that accepts output of error_get_last() as $code and mask itself as that error. |
| Horde_Exception_NotFound | Exception thrown if an object wasn't found. |
| Horde_Exception_Pear | Horde exception class that converts PEAR errors to exceptions. |
| Horde_Exception_PermissionDenied | Exception thrown if any access without sufficient permissions occured. |
| Horde_Exception_Translation | Horde_Exception_Translation is the translation wrapper class for Horde_Exception. |
| Horde_Exception_Wrapped | Horde exception class that can wrap and set its details from PEAR_Error, Exception, and other objects with similar interfaces. |