Types of licenses and their distinction

The type of the necessary license is defined only by the type Exchange Server license: the License for SBS is for a server using SBS; the License for Exchange Server is for a server running Exchange Standard Edition; the License for Exchange Server Enterprise is for a server running Exchange Server Enterprise Edition.

For this program to process messages, it should be installed on all servers with message stores or stores of general folders. For each server, a separate license is needed.