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Re:Show HN: I'm working on an open-source Gmail replacement by inoop on Wednesday November 06, 2013 @09:14AM (#6682727)
Have a look at Zarafa (http://www.zarafa.com/). It's free and open source, although Outlook integration is a paid option (via a plug-in). Comes with a modern webapp (http://www.zarafa.com/content/webapp).
Re:Show HN: I'm working on an open-source Gmail replacement by rufugee on Wednesday November 06, 2013 @03:34PM (#6685319)
And also...Zimbra (http://www.zimbra.com). This is what I've used to replace gmail for now, and aside from some quirks, it's working well.
Re:Show HN: I'm working on an open-source Gmail replacement by Nux on Wednesday November 06, 2013 @05:02PM (#6685809)
Zimbra is pretty damn nice. A bit resource hungry, but very functional.
Re:Show HN: I'm working on an open-source Gmail replacement by hugoroy on Wednesday November 06, 2013 @11:32AM (#6683525)
> It's free and open source, although

There's also kolab.org which is completely free software (uses Roundcube for web interface since 3.1).

Re:Show HN: I'm working on an open-source Gmail replacement by samspenc on Wednesday November 06, 2013 @01:23PM (#6684340)
Zarafa is awesome! Is that a custom web-app? It resembles Outlook; just want to confirm that its actually not.
Re:Show HN: I'm working on an open-source Gmail replacement by mverwijs on Wednesday November 06, 2013 @04:31PM (#6685644)
As an ex-zarafa employee I can confirm it is written in-house, from scratch. Uses Extjs.

Also see: https://community.zarafa.com/

Re:Show HN: I'm working on an open-source Gmail replacement by inoop on Thursday November 07, 2013 @02:36AM (#6688155)
It's a custom webapp that's modeled after Outlook, hence the resemblance. Try the demo, I'm sure you'll like it ;)
Re:Show HN: I'm working on an open-source Gmail replacement by mverwijs on Wednesday November 06, 2013 @04:33PM (#6685659)
Outlook integration is a paid option, but z-push (ActiveSync implementation) is free.
Re:Show HN: I'm working on an open-source Gmail replacement by lazylizard on Wednesday November 06, 2013 @10:59PM (#6687418)