Been having a dig around for some SCOM stuff and came across these:
Just in case you missed this, Brett posted yesterday.
So for the Microsoft Unified Communications (UC) on HP Active Answers go here:
Found the Exchange link too ;-)
The Microsoft Exchange Server link on HP Active Answers is here:
Exchange 2003 Whitepapers: http://h71019.www7.hp.com/activeanswers/Secure/70568-0-0-0-121.html