I had ZoneAlarm Pro for a week or so. Gosh, ZA kept insisting I was being invaded over 100 times a night when I was sleeping. I'd run to the computer and fumble for the information. I was shocked to realize Zone Alarm thought my ISP's email server was an invader. I had Outlook Express set to check my email every 10 minutes. Some fast calculation showed that the "invasions" were indeed contacts from my ISP's email server. I uninstalled ZoneAlarm Pro, and promptly lost my internet connection. A bit of research exposed a known bug with ZA. I used Norton Utility's WinDoctor to fix that problem. I recommend people stay away from ZoneAlarm. Totally.