The Edge Transport role cannot be installed on the local computer
[This topic is intended to address a specific issue called out by the Exchange Server Analyzer Tool. You should apply it only to systems that have had the Exchange Server Analyzer Tool run against them and are experiencing that specific issue. The Exchange Server Analyzer Tool, available as a free download, remotely collects configuration data from each server in the topology and automatically analyzes the data. The resulting report details important configuration issues, potential problems, and nondefault product settings. By following these recommendations, you can achieve better performance, scalability, reliability, and uptime. For more information about the tool or to download the latest versions, see "Microsoft Exchange Analyzers" at http://go.microsoft.com/fwlink/?linkid=34707.]
Topic Last Modified: 2007-01-03
Microsoft® Exchange Server 2007 setup cannot continue because its attempt to install the Edge Server role found other Microsoft Exchange roles already installed on this server.
Exchange 2007 setup cannot install the Edge Server role on a server that has other Microsoft Exchange roles installed.
The Microsoft Exchange Edge Server role is deployed in your organization's perimeter network and handles all Internet-facing mail flow. It provides the encryption and decryption of messages sent between trusted Microsoft Exchange organizations, and also protection against spam.
To resolve this issue, install the Edge Server role on a computer that does not have other Microsoft Exchange roles installed.