I agree with the current majority. Use off the shelf software to get started.
My company uses an install of Wordpress with the GTD theme (P2 Theme is also an option) for communication - it is basically a twitter/yammer clone. We have 20 people and it has been an awesome tool. Of course you can easily add forums (bbpress) and a ton of other functionality with 10k+ plugins available.
My company uses an install of Wordpress with the GTD theme (P2 Theme is also an option) for communication - it is basically a twitter/yammer clone. We have 20 people and it has been an awesome tool. Of course you can easily add forums (bbpress) and a ton of other functionality with 10k+ plugins available.
This could be built/ready in 1-2 days.
http://p2theme.com/