I'll tell you that SME is still the best Server Program Bar None! I have bought other Program NetMax by cybernet.com, H-sphere by psoft.net Where I don't mind paying for a program or Help! But when you pay for a program $400.00 to $500.00 for the program! Then you need to pay a large amounts for help or get no help.
With SME is downloadable Free to You, Get Help Free though the Forums, FAQ's and other are willing to help at no cost and only ask that you Donate what every you can! You may not get all the right answers you want everytime, but most the time. Because you should read, before you ask on the Forums. Now paying for a SME CD on ebay that person is not trying to make a living off the sale of the program. See what it cost downloading the program write extra information for the the install and put it on a CD.
I paid $7.00 for a CD of Jumbo Linux for A DNS Server that sold on ebay an excellent DNS linux program. When I could not find a way to get the DNS to work on SME.