The Ideal Blogging Platform

[WeAreKochs]

4. Yammer

It doesn't sound like you need a blogging tool. For internal use, you may be better served by an enterprise collaboration or document management system like Yammer or Sharepoint. Given your resource constraints, Yammer may be a good solution. It is more of a Twitter like system than a blogging platform but, last time I checked, it allowed for file attachments that could hold larger form documents. It is probably the best free alternative to higher priced knowledge management systems.

Yammer is owned by Microsoft. While they "have user information to do with as they will", it is designed as a business tool and they are unlikely to piss off their far larger business customers by trading on your data.