The local computer is already running Exchange Server
[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: 2007-01-15
Microsoft® Exchange Server 2007 setup cannot continue because the local computer has previous Microsoft Exchange components installed.
Exchange 2007 setup requires that the local computer not have existing Microsoft Exchange components installed.
To resolve this issue, remove any Microsoft Exchange 2000 Server or Microsoft Exchange Server 2003 components, and then rerun Microsoft Exchange setup.
To remove Microsoft Exchange components
Click Start, point to Settings, and then click Control Panel.
Double-click Add or Remove Programs.
In the Currently installed programs list, click Microsoft Exchange, and then click Change/Remove.
In Microsoft Exchange Installation Wizard, click Next.
In the Action list on the Component Selection page, click the down arrow next to each component that has been installed, and then click Remove.
Installed components have a check mark in the Action list. When you click Remove, the check mark is replaced by the word Remove.
Click Next two times.