I'm looking to setup an Intranet site, and need something easy to implement and manage. I was thinking of using a message board such as ultimatebb.com and installing it on my server. Basically I need a calendar, place for users to download files, post questions and announcements. Will this work? Any other suggestions? Thank you.

So you want an Intranet portal.

What is your current infrastructure and technical ability or access to it.