I don't really think there is an answer that you want to hear unfortunately.
LANDesk currently does not have a solution for those three items that I know of.
I'm not expecting Landesk to fill the holes, but I figure everyone here has similar holes, and I'm just looking to see how others fill the holes for ideas on how I can do it.
It would be nice if Landesk could do servers tho - that would plug the biggest hole. There are a lot of stand alone mail products I could plug in for the Anti-spam etc.
If you look at the official System Requirements for LANDesk AntiVirus (http://www.landesk.com/SolutionServices/product.aspx?id=1452), it says that Windows 2000 Server, Windows 2000 Advanced Server, Windows 2003 Server Standard, Windows 2003 Server Enterprise and Windows 2003 Server (64-bit) are supported.
Currently, though, we do not support installing LDAV on the core.
We installed the FULL boxed product Kaspersky on our servers including our Exchange Server. We are having great luck with it, esp. after some minimal configuration including NOT scanning our images and software installs as they come down from the network.
The clients have LDAV installed... so we are an all Kaspersky shop now. We had previously used Symantec on our servers and CA eTrust on our clients.
Hope this helps!