best groupware

dear experts,

I want to use open source software as group management system for our employees working at home and communicate each others, i need features such as:

1. user management and login for each employee
2. calendar, schedulling, reminder
3. chat
4. bulletin board
5. webmail

all these functions grouped in one system/software. Is there any recommend software for this purpose? thanks.
LVL 3
wuyinzhiAsked:
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daleoranConnect With a Mentor Commented:
Check this out. It seems to have everything you need

http://www.phprojekt.com/features.php

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mgonulluCommented:
This is a great one:
http://www.dimdim.com
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oheilCommented:
We use
http://www.egroupware.org/
a couple of years now.
The chat functionality comes not with the base package but is available on the web page (chatty).

Regards,

Oli

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wuyinzhiAuthor Commented:
thx, i think phprojekt.com is the best choice for my purpose. thx all
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