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I use Outlook 2003 on my Win 7 HP laptop and have no problems connecting to any POP mail accounts. Win 7 has a built in mail client that I believe was meant as a replacement for Outlook Express, it is not difficult to setup, but takes some time to get used (my wife's laptop is using this setup). I don't think you would have any problems with sending that many emails at one time, I would think it would be a limitation from your Internet provider (mail provider) and not the mail client.

I'm sure others will chime in too.