Installing Exchange 2010 sp2 on to a SBS Server 2011. Install fails when removing Exchange Files with - 1618 error.
This is the last thing in the ExchangeSetup.log
[12/06/2012 13:38:16.0440] [1] Ending processing remove-InstalledLanguages
[12/06/2012 13:38:16.0455] [0] **************
[12/06/2012 13:38:16.0455] [0] Setup will run the task 'uninstall-msipackage'
[12/06/2012 13:38:16.0455] [1] Setup launched task 'uninstall-msipackage -logfile 'C:\ExchangeSetupLogs\ExchangeSetup.msilog' -ProductCode '4934d1ea-be46-48b1-8847-f1af20e892c1' -PropertyValues 'BYPASS_CONFIGURED_CHECK=1 DEFAULTLANGUAGENAME=ENU''
[12/06/2012 13:38:16.0455] [1] Active Directory session settings for 'Uninstall-MsiPackage' are: View Entire Forest: 'True', Configuration Domain Controller: 'MYSERVER.mydomain.local', Preferred Global Catalog: 'MYSERVER.mydomain.local', Preferred
Domain Controllers: '{ 'MYSERVER.mydomain.local }'
[12/06/2012 13:38:16.0455] [1] Beginning processing uninstall-msipackage -LogFile:'C:\ExchangeSetupLogs\ExchangeSetup.msilog' -ProductCode:'4934d1ea-be46-48b1-8847-f1af20e892c1' -PropertyValues:'BYPASS_CONFIGURED_CHECK=1 DEFAULTLANGUAGENAME=ENU'
[12/06/2012 13:38:16.0487] [1] Removing MSI package with code '4934d1ea-be46-48b1-8847-f1af20e892c1'.
[12/06/2012 13:38:19.0560] [1] [ERROR] Unexpected Error
[12/06/2012 13:38:19.0560] [1] [ERROR] Couldn't remove product with code 4934d1ea-be46-48b1-8847-f1af20e892c1. Another installation is already in progress. Complete that installation before proceeding with this install. Error code is 1618.
[12/06/2012 13:38:19.0560] [1] [ERROR] Another installation is already in progress. Complete that installation before proceeding with this install
[12/06/2012 13:38:19.0622] [1] Ending processing uninstall-msipackage