From: Keith Matthews (postfixfrequentous.co.uk)
Date: Sun Feb 19 2006 - 08:46:34 CST

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On Sun, 19 Feb 2006 14:13:29 +0000
Matt Fretwell <mattfbauchan.org> wrote:

>
> > If MS-Exchange is compulsory, alas no... Outlook is the only
> > MS-Exchange client, but MS-Exchange is not a smtp system...
>
> Nicking your reply from another thread, Erwan :)
>
> Might anyone suggest a server/client pair, *NIX based
> obviously :), that will give the same type of groupware
> capabilities as Exchange, i.e: calendar/diary functions. A
> customer is actually thinking of using Exchange, and I could do
> with finding out about a viable alternative for the groupware
> capabilities to get them back on a sensible path. Off list
> replies would be appreciated, and apologies for the off topic
> post.
>
>

In the same vein the ones that come to mind are Zimbra and OpenExchange.
 Both use Postfix as the SMTP component.

Zimbra is a lot easier to install, but the install only works for a very
restricted number of platforms - RHES 3, FC3 and SLES9 from memory. It's
available as free and commercial versions. A recent release of the
commercial version seems to include connectors for Outleak.

OpenExchange is not difficult to set up but you have to gather many
components together from different places to make it work and there can
be some serious version incompatibility with the default 'get the latest
version' assumption so many of the projects seem to have. Especially as
none of them seem to document which of their versions works with a given
version of something else.

There's a couple of web-based alternatives too.

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