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This is not for me personally but for everyone searching this in a search engine, so this is a community wiki question.

This question is based on this answer in which he stands that Mozilla Thunderbird is a alternative for Outlook. While Thunderbird is great for SoHo I simply disagree that it's an alternative to Outlook at company level.
In fact I would say that there is no good open source alternative for Microsoft Outlook (+Exchange) which can be used to entirely replace Outlook company wide.

I would like to hear your opinions on the following questions:

  • Is there such an open source PIM suite (+server) which can compete with Outlook (I can even be web-based, as long as it's hosted internally, so no Google Mail/etc.)?
  • If there is one: Have you personal experience with using and/or migration? What are key points?
  • If not, why is this missing?
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7 Answers

Zimbra seems to be what you are looking for

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Not open source, but you could consider Google Apps for Domain. Not directly comparable to Exchange/Outlook, but if you consider this alternative and the company is willing to change the way the company works, this will give additional benefits from a collaboration viewpoint.

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IMHO, add salt and pepper to taste, there are no GOOD open source alternatives.

But, I agree with tronda, Google Apps for Domains is pretty awesome and covers MOST of the bases. We use it in a 20+ company, having migrated off Exchange. Nobody has complained at all.

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Go web based. Lotus Notes web mail is under-rated, zimbra isn't bad.

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Evolution (projects.gnome.org/evolution/) can replace Outlook as Microsoft Exchange client (it works over OWA).

If you're looking for complete client+server solution - Zimbra (as already specified above) it's a good solution.

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If You want to have your own mailing system to manage mails, Its very good to have zimbra mailing server. Even we have given zimbra server for our clients it manages superbly. But it requires hardware requirement.

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Zimbra - http://www.zimbra.com/ . The most promising of them all. Now owned by Yahoo.

Open-XChange - http://www.open-xchange.com/oxpedia

Open Groupware - http://www.opengroupware.org

Also there used to be hula-project which Novell infamously dumped in 2006. AFAIK, the project seems to have dead and there is no active development happening now. The source code for that is still lying available via SVN from Novell's servers (http://developer.novell.com/wiki/index.php/Hula_Subversion).

And also there is the Kolab Groupware project. (http://www.kolab.org). You can use it along with a Horde Webmail and Calendar. It can also work with a variety of other clients including Outlook, Kontact, Thunderbird.

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