I'm a long time ZoneAlarm user who fell away when they had so much trouble with XP. Now it's pretty good and I'm using version 4 on one computer exclusively along with Norton AV.
I use McAfee Spam Killer 4.5. It's solid--not perfect, but for me more reliable than the several others I tried.
I keep coming back to Norton Firewall and find it effective for blocking internet scans and outgoing calls I don't want made. The pro version has been particularly brilliant on the machine I use for serving, where there are more ports open. It catches scans and even will do an IP search.
In general, I never felt comfortable with McAfee AV and firewall--purely subjective opinion, worth about what you paid for it. Best always to go with what you feel comfortable with.
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