Trying to Install the Exchange Server 2010 Trial on a Windows 2008 SP2 server and during the installation, I get a failure on the Mailbox Role installation. This prompts me to remove the MB role prior to trying again and this is what I'm getting. Can't seem to find a solution or answer. Help would be greatly appreciated. C:\Users\psk>setup.com /mode:uninstall /role:MB Welcome to Microsoft Exchange Server 2010 Unattended Setup Preparing Exchange Setup The type initializer for 'Microsoft.Exchange.Management.PowerShell.CmdletConfigurationEntries' threw an exception. Duplicate type with name 'Microsoft.Exchange.UM.UMCommon' in assembly 'Microsoft.Exchange.UM.UMCommon, Version=14.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. Exchange Server setup encountered an error. C:\Users\psk>

Try to remove the Exchange through the Control Panel Add/Remove porgrams.Elie B. MCITP: EMEA|EA|SA; MCTS: Microsoft Exchange Server 2010: Configuration; Blog: http://blog.elieb.info

Where do you obtain the installation files? Please use the files (Exchange 2010 RTM) in this link to deploy the exchangeJames Luo TechNet Subscriber Support (http://technet.microsoft.com/en-us/subscriptions/ms788697.aspx) If you have any feedback on our support, please contact tngfb@microsoft.com