Norton Anti-spam slowing email download to a stop

I am not sure whether there was a recent update installed yesterday, but my email download time was so slow Outlook 2010 would time out. After several frustrating hours trying to nail down the root of the problem, it turns out it was the anti-spam feature of Norton Internet Security. Turned it off, downloads fine. Some digging around on this forum revealed that they've had this problem before in earlier releases. Hopefully this kink will be worked out soon.