| Horde_Imsp_Auth_Base | Abstract IMSP authentication class. |
| Horde_Imsp_Auth_CramMd5 | IMSP authentication class for CRAM-MD5 authentication. |
| Horde_Imsp_Auth_Imtest | IMSP authentication class for authentication through imtest. |
| Horde_Imsp_Auth_Plaintext | IMSP authentication class for plaintext LOGIN authentication. |
| Horde_Imsp_Book | Horde_Imsp_Book Class - provides api for dealing with IMSP address books. |
| Horde_Imsp_Client_Base | The Horde_Imsp_Client base class. |
| Horde_Imsp_Client_Socket | The Horde_Imsp_Client base class. |
| Horde_Imsp_Exception | The Horde_Imsp_Exception class |
| Horde_Imsp_Options | Horde_Imsp_Options Class - provides an interface to IMSP server-based options storage. |
| Horde_Imsp_Translation | Horde_Imsp_Translation is the translation wrapper class for Horde_Imsp. |