What about starting with Zimbra's Open Source edition, and building onto it?

On Tue, Jun 7, 2011 at 9:13 PM, Santino Codispoti <
santino.codisp...@gmail.com> wrote:

> Does anyone happen to know what Microsoft using to delivery Hotmail?
> Is it Exchange?  Can anyone recommend a good system for developing web
> mail services?  I need something that can easy support 400K users
>
>

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