Windows 2003 server doesn't support kaspersky,which anti-virus is best for 2003 server?

For server based A/V I would use Norton Enterprise or CA ETrust.

For server based A/V I would use Norton Enterprise or CA ETrust.
What is "based A/V "?
And is Norton Enterprise best between other?

The phrase was server based A/V. I think that should be obvious that it refers to an anti-virus program run from a server.

I'm not a big fan of Norton, but their A/V enterprise edition is among the most popular. But I like the CA tools.

the phrase was server based A/V. I think that should be obvious that it refers to an anti-virus program run from a server.

I'm not a big fan of Norton, but their A/V enterprise edition is among the most popular. But I like the CA tools.
CA tools? Which version?

I told you. Their ETrust line of products. Try this site:

Security, Small and Medium Business (http://www3.ca.com/smb/solution.aspx?ID=5276)