Error when trying to reinstall Client Access role



    because I had a problem with a dll that was corupted and coulden't been enymore used by OWA, I decided to reinstall Client Access role. So, I've uninstalled the CA role using setup /mode:uninstall /role:CA without problems, but wen I'm trying to reinstall it I have the folowing error. The same with the graphical wizard.


    E:\>setup /mode:install /role:CA

    Welcome to Microsoft Exchange Server 2007 Unattended Setup

    Preparing Exchange Setup

    The following server roles will be installed
        Client Access Role

    Performing Microsoft Exchange Server Prerequisite Check

        Client Access Role Checks        ......................... COMPLETED

    Configuring Microsoft Exchange Server

         Opening package 'E:\exchangeserver.msi' failed. Another version of this pro
    duct is already installed.  Installation of this version cannot continue.  To co
    nfigure or remove the existing version of this product, use Add/Remove Programs
    on the Control Panel. Error code is 1638.

    The Exchange Server setup operation did not complete. Visit http://support.micro
    soft.com and enter the Error ID to find more information.

    Exchange Server setup encountered an error.

    Thursday, November 29, 2007 6:36 PM

All replies


    Exchange 2007 - Error code is 1638



    Download the Windows Installer Cleanup Utility using the link below:



    Clear the following instances of Exchange 2007 using the utility:


    1.Microsoft Exchange Server

    2. Microsoft Exchange 2007 Enterprise Anti-Spam Signature

    3. Microsoft Exchange 2007 Enterprise Block List Update

    4. Microsoft Exchange 2007 Standard Anti Spam-filter Update

    5. Microsoft Full Test Indexing Engine for Exchange


    Set the Exchange 2007 services to ’Automatic’ in services snap-in if they are not set to ’Automatic

    Tuesday, May 06, 2008 9:47 AM

    Clear the following instances of Exchange 2007 using the utility:


    Is this for real? Has anyone tried this. I am having the same problem with CAS. I cannot install it or remove it.






    Wednesday, July 23, 2008 12:33 AM

    You will receive this error if you try to reinstall the role from your original installation files/CD after you have applied SP1 to your server. If that's the case, the solution is to reinstall the role from the SP1 setup.
    Wednesday, July 23, 2008 11:07 AM