What is the difference between Alfresco Community Edition and Alfresco Enterprise Edition ?
In my opinion, the Community Edition is generally sufficient to serve about 50 concurrent users. This should be good enough for most usage scenarios. The Community Edition has all the core features that the Enterprise Edition has. The only difference is, you do not get official technical support for the Community Edition from the company. However, Alfresco has a strong users community base that provides assistance when needed.
You can try Alfresco Community Edition by subscribing to hosted services offered at http://www.alfresco-fusion.com
After signing up you will be offered fully functional Alfresco Server at a very affordable monthly cost.