Client Access server role is already installed
Applies to: Exchange Server 2016
Microsoft Exchange Server 2016 Setup has detected that you’re attempting to install a server role; however, a role is already installed on the computer.
If you want to reinstall the a server role, you must first uninstall Exchange and then install the server role.
You may also receive this message if a previous installation of Exchange didn’t complete successfully. If this happens, uninstall Exchange and then reinstall the server role. If the installation continues to fail, do the following:
Make sure that your organization and the computer you're installing Exchange on meet the Exchange 2016 system requirements.
Make sure that you've installed all the prerequisites required by Exchange, as described in Exchange 2016 prerequisites.
Read the Release notes for Exchange 2016.
View the Exchange Setup log located in <installation drive>:\ExchangeSetupLogs\ExchangeSetup.log, and look for errors or warnings that may have occurred during Setup.
Search the Exchange Server forums. In your search query, specify the title of this topic.
Search the Internet using your favorite search engine. Be sure to include the title of this topic in your search.
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