There is no difference in the installer for Xeams Community and Enterprise Edition. It will run as if you have purchased the Enterprise Edition for the first 30 days. It will then get converted to Community Edition unless a license is purchased.
Lance,
The web interface for Xeams does not have a full webmail client. The web interface only allows you to see emails you have received. You can try using open source webmail clients such as RainLoop.