Trouble installing Exchange 2010 on W2K8r2 .. please help :)

I’m utilizing this script with Exchange 2010 but I had to make a few small tweeks. Also be sure your running this from one of the cass servers First off change the PSSnapin to load the Exchange 2010 module.

“   if (-not((Get-PSSnapin) -match "Microsoft.Exchange.Management.PowerShell.E2010")){ Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010 }   ”
Next, edit the $SMTPClient to match this line- “   $SMTPClient = New-Object Net.Mail.SmtpClient("127.0.0.1")  “

After you have the script customized run this section of the command to create a reg key.

##########################BEGIN####################
$strScriptName = $MyInvocation.MyCommand.Name
if (!(Get-ItemProperty HKLM:\Software\Innervation\$strScriptName -Name LastRun -EA SilentlyContinue)){
    # this is the first time the script has run - let's create the registry key and value for future runs
    New-Item -path HKLM:\Software\Innervation -EA SilentlyContinue | Out-Null
    New-Item -path HKLM:\Software\Innervation\$strScriptName | Out-Null
    New-ItemProperty -path HKLM:\Software\Innervation\$strScriptName -Name "LastRun" -Value (Get-Date) -propertyType String | Out-Null
    write-host "Initial configuration completed." -ForegroundColor green
}
# get time stamp from registry so we know when it last ran
$LastRun = Get-Date ((Get-ItemProperty -path HKLM:\Software\Innervation\$strScriptName -Name LastRun).LastRun)
$ElapsedTime = ((Get-Date) - $lastrun).TotalSeconds
######################END####################################

Then comment out the last line for testing purposes.

#########################BEGIN###############################
Set-ItemProperty HKLM:\Software\Innervation\$strScriptName -Name "LastRun" -Value (Get-Date) | Out-Null
######################END#######################

Create a new user account and test your script till your happy. After it works as intended remove the comment.

@Toshana

If you really don't have any Exchange server in your domain, your best bet would be to fire up your trusty ADSIEdit and remove the Exchange Organization object. It should be in Configuration\Services\Microsoft Exchange\OrganizationName. If you remove "Microsoft Exchange" under "Services", all Exchange-related informations should go away.

You should also remove the computer object for the old Exchange 2007 server(s).

If even after this cleanup the installer keeps complaining, try manually running setup /PrepareSchema; this should take care of schema version mismatches, if there is any.

Oh, and it would also be useful to check if your domain controllers are properly replicating; maybe they aren't, and one or more of them still have Exchange-related objects lingering around even if you removed them.