Exchnage Server Equiv. for FC5

[Craig White]

On Wed, 2006-06-21 at 07:55 +0100, Chris Bradford wrote:
> Hi guys,
> 
> I'm looking to setup a new email server, and rather than use Exchange,
> I'm hoping to use a FC5 box to do this.
> 
> What I want to know is whether there is an Open Source equiv. that will
> do the following:
> 
> Provide Mailbox's for multiple users (around 500)
> Provide Contacts via Active Directory
> Calendar and Tasks with notifications.
> SMTP
> IMAP / POP3
> Spam Filtering and Anti-Virus
> Individual Mailbox Backup and Recovery
> 
> I know its a lot to ask, but I would prefer this to be Linux based as
> were rolling out Fedora Core 5 like there's no tomorrow! I also expect
> that it would be based around several Open Source projects rather than a
> single program that would do everything.
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http://wiki.samba.org/index.php/Exchange_Server_Alternatives

Craig