Dear All I have problem with test box of exchange 2010 Server, but when try to uninstall I got error Summary: 6 item(s). 1 succeeded, 1 failed. Elapsed time: 00:00:03 Preparing Setup Completed Elapsed Time: 00:00:02 Mailbox Role Failed Error: The following error was generated when "$error.Clear(); if ($RoleProductPlatform -ieq "amd64") { $comClassFile = join-path $RoleInstallPath "bin\Monitoring\x86\DiagnosticCmdletController.dll"; $regSvr32WOW = join-path (join-path $env:SystemRoot sysWOW64) regsvr32.exe; start-SetupProcess -Name:"$regSvr32WOW" -Args:"/s /u `"$comClassFile`"" -Timeout:120000; }" was run: "Process execution failed with exit code 5.". Process execution failed with exit code 5. Elapsed Time: 00:00:00 Stopping Services Cancelled Remove Exchange Files Cancelled Restoring services Cancelled Finalizing Setup Cancelled Please let's me know Hoe to fix this issue

Have you had a look at the following article? http://support.microsoft.com/kb/951183 It's for Exchange 2007 but it might be applicable on Exchange 2010 as well.Martin Sundstrm | Microsoft Certified Trainer | MCITP: Enterprise Messaging Administrator 2007/2010 | http://msundis.wordpress.com

Hello If you are unable to uninstall it from Add/remove programs you can also try this solution uninstalling maunally. http://msgsense.com/2011/01/18/manually-uninstall-last-exchange-2010-server-from-organization/Thanks Mhussain

Dear MMHussain This is not last exchange server, are you have another way to do Dear Martin I chaeck on exchange server, I found "DiagnosticCmdletController.dll" is on C:\Program Files\Microsoft\Exchange Server\v14\BIN\Monitoring\x86, but when I go to start ==> run and put "regsvr32.exe DiagnosticCmdletController.dll" it show error "The modue "DiagnosticCmdletController.dll" failed to load Make sure the binary is stored at the specified path or debug it to check for problems with the binary or dependent .DLL files The specified module could not be found" please help me how I should do on next step

Go to the ExchangeInstallationFolder\bin\Monitoring\x86\ and run regsvr32 DiagnosticCmdletController.dll without inverted commas Thanks Mhussain

Hi densei27, Any updates on your issue? Please make sure you run the command with administrator permission. And "change the directory to the location of the DiagnosticCmdletController.dll file". Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

I had the same problem trying to uninstall Exchange 2007 after Exchange 2010 installation. I have noticed from the Exchangesetuplogs that the setup tried to register DiagnosticCmdletController.dll in x86 folder although a 64-bit platform. I switched the dll in the X86 and AMD64 folders until the setup has not set the correct path. Then I registered the DiagnosticCmdletController.dll and the uninstallation was successful.