Outlook Exchange Server to Open Source Alternatives?

[Craig White]

On Mon, 2008-09-08 at 09:23 -0700, Mike McMullen wrote:
> Hi All,
> 
> As part of a larger project to move our company away from Microsoft
> products, I'm investigating options for replacing our enterprise
> exchange server.
> 
> We have about 500 mailboxes that would need to ported out as well as
> public folders and contacts/calendars etc.
> 
> Can anyone recommend a linux groupware solution that would enable us to
> provide an Outlook like environment? And allows importing of prior data?
----
I created this page on wiki.samba.org 
http://wiki.samba.org/index.php/Exchange_Server_Alternatives

Importing mailboxes, I use imapsync

Personally, if the intent is that users keep using their Outlook, then
you probably have to look at the non-free options because Outlook is a
really lousy IMAP client (by design).

I always have my clients use Horde/IMP/Turba/Kronolith/etc. which allows
you to use any mail/addressbook/calendar client

Craig