Thunderbird

I used Thunderbird for about a year, and I was pretty impressed with the junk filter. It picked up the most obvious messages, and was "trainable" in that you could tell it a message was spam and it would remember from that point on.

I went to try the beta Outlook 2007, and it picked up more than Thunderbird did initially. I still have to manually mark some messages, but Outlook picks up about 90-95% of the unwanted ones.

I like both programs, but with the interlacing of Outlook with so many other things, it is my current preference.

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Thunderbird cuts it with the best out there, when it comes to user email solutions.

For spam filtering though I'd strongly recommend using the local client only for spotting headers added to your mail by your mail server.

Using dsbl's at the mail server will reduce your spam considerably and get your users removed from spam lists. To receive the email and, heaven forbid downloading the attached images, will make the matter far worse.

Then a decent spam filter at the server can make judgements on the rest and either reject the mail, file it and tag and send it.

In my opinion this is a better solution than relying on thunderbird, outlook or whatever alone.