Exchange 2010 SP3 Upgrade Error SBS2011

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When running an Exchange 2010 Upgrade to SP3 on SBS2011 you might come across the following error:

Error:
The following error was generated when "$error.Clear();
Write-ExchangeSetupLog -Info "Creating SBS certificate";

$thumbprint = [Microsoft.Win32.Registry]::GetValue("HKEY_LOCAL_MACHINE\Software\Microsoft\SmallBusinessServer\Networking", "LeafCertThumbPrint", $null);

if (![System.String]::IsNullOrEmpty($thumbprint))
{

Write-ExchangeSetupLog -Info "Enabling certificate with thumbprint: $thumbprint for SMTP service";

Enable-ExchangeCertificate -Thumbprint $thumbprint -Services SMTP;

Write-ExchangeSetupLog -Info "Removing default Exchange Certificate";

Get-ExchangeCertificate | where {$_.FriendlyName.ToString() -eq "Microsoft Exchange"} | Remove-ExchangeCertificate;

Write-ExchangeSetupLog -Info "Checking if default Exchange Certificate is removed";

$certs = Get-ExchangeCertificate | where {$_.FriendlyName.ToString() -eq "Microsoft Exchange"

};
if ($certs)
{

Write-ExchangeSetupLog -Error "Failed to remove existing exchange certificate"

}
else
{

Write-ExchangeSetupLog -Warning "Cannot find the SBS certificate";

}
" was run: "The certificate with thumbprint <> was not found.".

The certificate with thumbprint <> was not found.
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=14.3.123.3&e=ms.exch.err.Ex88D115&l=0&cl=cp

Solution:

Make a backup of the key below.

Delete the value inside the following registry key:

HKEY_LOCAL_MACHINE/Software/Microsoft/SmallBusinesServer/Networking/LeafCertThumbprint

Rerun the setup and it should complete.