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The local computer is already running Exchange Server_ExchangeAlreadyInstalled

[This topic is prerelease documentation and is subject to change in future releases. Blank topics are included as placeholders. If you have feedback, we'd love to hear it! Email us at ExchangeHelpFeedback@microsoft.com.]  

Applies to: Exchange Server

The content in this topic hasn't been updated for Microsoft Exchange Server 2013. While it hasn't been updated yet, it may still be applicable to Exchange 2013. If you still need help, check out the community resources below.

Having problems? Ask for help in the Exchange forums. Visit the forums at: Exchange Server, Exchange Online, or Exchange Online Protection.

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
  1. Click Start, point to Settings, and then click Control Panel.

  2. Double-click Add or Remove Programs.

  3. In the Currently installed programs list, click Microsoft Exchange, and then click Change/Remove.

  4. In Microsoft Exchange Installation Wizard, click Next.

  5. 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.
  6. Click Next two times.

  7. Click Finish.

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