Win2000 server migrating to SuSE Linux

I have a client migrating from a windows 2000 server, with exchange 2000 to the Novell SuSE Linux Enterprise server 9. I’d like to know if anyone has any experience with and/or recommendations on spam/spyware control that will run on the SuSE platform. The SuSE server will replace everything (email, file/print sharing, VPN, webserver).