Just a friendly reminder that on September 30th (as in 2 days from now) the Sametime 7.5.x family of products hits the end of Support. Sametime 7.5.x was released between October of 2005 and May of 2007.
Now is probably a good time to be looking at Sametime 8.5.2. You can also pre-order the Sametime Administration Guide written specifically for Sametime 8.5.2 and due out later this year.