Exchange build numbers and updates

Reading the build number

In the Exchange Management Shell, the file version of ExSetup.exe shows the exact level including the security update:

Get-ExchangeServer |
  ForEach-Object {
    Invoke-Command -ComputerName $_.Fqdn -ScriptBlock {
      (Get-Command ExSetup.exe).FileVersionInfo.FileVersion
    }
  }

AdminDisplayVersion from Get-ExchangeServer only shows the CU, not the installed security update. Use the file version for the check above.