I see time and time again such services running in a business environment with only 10 users. Everyone in the office authenticates with the DC and interacts with a shared drive where files and documents are stored. I can't help but think...reeeeealy? But I don't know, that's why I'm asking. To me it seems like you need to reach a certain threshold of size and needs before you throw a DC into the mix. ie: a 20+ user business (and growing) with permission requirements that separate the sales team from accounting. Thoughts?