Comment Wordpress is what you need (Score 2) 161
Download a copy of Wordpress to an outsourced web server hosting account (many secure options available for ~$100/year). It takes 3 minutes to setup.
Wordpress's backend interface is the easiest to use and understand for folks who just need to share information and documents with others. There isn't the level of complexity (out of the box, but it's available if needed) that other CMSs have (like Drupal). Drupal is not recommended if you're not already familiar with Drupal.
Then pick one of the attractive themes from the thousands available, load in a few helpful plugins, and give accounts to folks who may be responsible for different areas of content.
Wordpress can easily grow if your needs grow. But out-of-the-box, it's so easy to use and manage, it's the no-brainer choice.
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Psych Central
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