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.
Don,
Seeing a subject that starts with =?ISO... is not necessarily a problem. Email headers cannot be in any other language but English and therefore, foreign languages are encoded using this method.
What is the exact score of these emails?