Linux Exchange Alternative - Mail Collaboration

This is a two part question.

I am looking for linux alternatives to Microsoft Exchange for my company. In particular, something with these features:

1. Multiple users, each with their own mailbox, all data stored on server
2. Shared calendar, contacts, notes
3. Synchronization with Outlook
4. Synchronization of calendar/contacts/notes with Windows Mobile (e.g. Palm Treo)
5. NOT Zimbra, or Open-XChange. I've already seen those

That's part 1.

Part 2: I already know of some open source linux package that does just this, but I forget it's name.

It starts with a K.  Kir... Kim... It's like a 6 letter, 2 syllable word that starts with a K, and it is basically the same as Zimabra. Can anyone tell me what it's called?
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Frosty555Asked:
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darrickhartmanConnect With a Mentor Commented:
Kerio Mail server has all of those features.  

http://www.kerio.com/

I have a client using that and has been very happy with the product.  In the past they had use Bynari's Insight Server, but Kerio's product is far and away better.
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Chad SmithSoftware EngineerCommented:
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Frosty555Author Commented:
Kerio! That's the one!
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