Intranet setup on Joomla 3 site

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
Need a private area on my joomla site for my 3 clients. Much like sharepoint.

Need to have the following abilities:
1 upload documents
2 create items in calendars
3 create tasks for employees
4 create discussion group for employees

I want the ability to manage all, however separate the client areas so that clients have separate calenders, tasks and discussions and documents.

Skills required:
PHP, Software Architecture
About the employer:
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