Can't get Tivoli Storage Manager API

Hi,I’m going to implement Tivoli Storage Manager for mail on our Domino (v 7) server on Windows 2003 platform.

IBM Tivoli Storage Manager for Mail installation Guide tells it has the following requirements:

1)Lotus Domino 6.5.x , 7.0.x, or 8 Server (or later) installed on the same machine as Data Protection for Domino.

2)Tivoli Storage Manager API Version 5.4.1 (or later).

3)Tivoli Storage Manager server 5.4.0 (or later)

4)Windows 2003 Enterprise Edition

I’ve looked for TSM API in IBM Distributed Software Price list and in IBM Partner world software downloads,however i found only

version for OS/400 plarform.

Please clarify.

Am I looking in wrong place or wrong product?