Currently the small business has about 10 computers 1 FreeNas Server and 10 employees.
Until their recent move into a new office they have each had their own computer with local accounts.
However now they will start having employees use different computers at different times of the day.
This is where the need for Active Directory comes in.
What kind of server hardware would you suggest to fill this need. Additionally what kind of server software should I use. I was thinking Microsoft Small Business Server Standard 2011.
EDIT: The business is a simple service business which simply uses Microsoft Word, Excel, Publisher. They also use the Google Apps for Business, and one other online application (that is hosted somewhere else) So the hardware needs are minimal.
EDIT 2: The business is a non-profit so costs for software are very low thanks to http://techsoup.org so I'm mostly wondering what server software would be best for my needs without too much included that I won't be using.