function Get-ADExchangeServers
{
   <#
      .SYNOPSIS
      Get all Exchange Servers from Active Directory

      .DESCRIPTION
      This function gets a list with info of all Exchange Servers from the Active Directory.
      The Exchange tools (or a PowerShell Connection) is not needed.
      That is the major difference to Get-ExchangeServer

      .EXAMPLE
      # Get all Exchange Servers from Active Directory
      PS> Get-ADExchangeServers

      path    : http://nycexch01.contoso.com/powershell
      server  : NYCEXCH01
      Fullver : Version 15.1 (Build 31034.26)
      version : 15.1
      Site    : HQ

      path    : http://nycexch02.contoso.com/powershell
      server  : NYCEXCH02
      Fullver : Version 15.1 (Build 31034.26)
      version : 15.1
      Site    : HQ

      .EXAMPLE
      # No Exchange Server found! (Error)
      PS> Get-ADExchangeServers

      Get-ADExchangeServers : Unable to get the Exchange Information from the Active Directory!

      .NOTES
      Only Exchange Servers with a configured PowerShell URI will be dumped
	#>
   [CmdletBinding()]
   [OutputType([psobject])]
   param ()

   begin
   {
      # Define some defaults
      $ErrorMessage = 'Unable to get the Exchange Information from the Active Directory!'
      $SC = 'SilentlyContinue'
      $STP = 'Stop'

      # Search configuration partition for Exchange Servers where the powershell virtual directory is enabled
      try
      {
         $ActiveDirectoryInfo = (New-Object -TypeName adsisearcher -ArgumentList ([adsi]"LDAP://$(([adsi]'LDAP://rootdse').configurationNamingContext)"), '(&(objectclass=msExchPowerShellVirtualDirectory)(msexchinternalhostname=*))')
      }
      catch
      {
         $paramWriteError = @{
            Message       = $ErrorMessage
            ErrorAction   = $STP
            WarningAction = $SC
         }

         Write-Error @paramWriteError
         break
      }

      if (-not ($ActiveDirectoryInfo))
      {
         $paramWriteError = @{
            Message       = $ErrorMessage
            ErrorAction   = $STP
            WarningAction = $SC
         }

         Write-Error @paramWriteError
         break
      }

      # Create a new Object
      $ADExchangeInfo = @()
   }

   process
   {
      try
      {
         $ActiveDirectoryInfo.findall() | Sort-Object -Descending -Property {
            $_.properties.msexchversion[0]
         } | ForEach-Object -Process {
            # Define some defauts
            $NONE = ' '
            $COM = ','

            if ($_.properties.msexchinternalhostname[0])
            {
               if ($_.properties.distinguishedname[0])
               {
                  $SrvLdapPath = ($_.properties.distinguishedname[0] -split $COM)[3 .. 100] -join $COM

                  try
                  {
                     $SingleServerObject = [adsi]"LDAP://$SrvLdapPath"
                  }
                  catch
                  {
                     $SingleServerObject = $null
                  }

                  if ($SingleServerObject)
                  {
                     if ($SingleServerObject.serialnumber[0])
                     {
                        $SingleFullVersion = $SingleServerObject.serialnumber[0]
                     }
                     else
                     {
                        $SingleFullVersion = $null
                     }

                     if (($SingleServerObject.serialNumber -split $NONE)[1])
                     {
                        $SingleShortVersion = ($SingleServerObject.serialNumber -split $NONE)[1]
                     }
                     else
                     {
                        $SingleShortVersion = $null
                     }

                     if ($SingleServerObject.name[0])
                     {
                        $SingleServer = $SingleServerObject.name[0]
                     }
                     else
                     {
                        $SingleServer = $null
                     }

                     if ($SingleServerObject.msExchServerSite[0])
                     {
                        $SingleActiveDirectorySite = $SingleServerObject.msExchServerSite[0] -replace '^CN=|,.*$', ''
                     }
                     else
                     {
                        $SingleActiveDirectorySite = $null
                     }
                  }

                  if ($_.properties.msexchinternalhostname[0])
                  {
                     # With each virtual directory create an object to represent its details,
                     # if List Version or site is included, also find the server object
                     $paramNewObject = @{
                        TypeName = 'psobject'
                        Property = @{
                           path    = $_.properties.msexchinternalhostname[0]
                           server  = $SingleServer
                           Site    = $SingleActiveDirectorySite
                           version = $SingleShortVersion
                           Fullver = $SingleFullVersion
                        }
                     }

                     $SingleExchangeInfo = (New-Object @paramNewObject)

                     # Append the Info to the Object
                     $ADExchangeInfo += $SingleExchangeInfo
                  }
               }
            }
         }
      }
      catch
      {
         # Do nothing
         Write-Verbose -Message 'Something went wrong...'
      }
   }

   end
   {
      # Just dump the plain object
      if ($ADExchangeInfo)
      {
         $ADExchangeInfo
      }
      else
      {
         $paramWriteError = @{
            Message       = $ErrorMessage
            ErrorAction   = $STP
            WarningAction = $SC
         }

         Write-Error @paramWriteError
         break
      }
   }
}

#region LICENSE
<#
   BSD 3-Clause License

   Copyright (c) 2021, enabling Technology
   All rights reserved.

   Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

   1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
   3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#>
#endregion LICENSE

#region DISCLAIMER
<#
   DISCLAIMER:
   - Use at your own risk, etc.
   - This is open-source software, if you find an issue try to fix it yourself. There is no support and/or warranty in any kind
   - This is a third-party Software
   - The developer of this Software is NOT sponsored by or affiliated with Microsoft Corp (MSFT) or any of its subsidiaries in any way
   - The Software is not supported by Microsoft Corp (MSFT)
   - By using the Software, you agree to the License, Terms, and any Conditions declared and described above
   - If you disagree with any of the terms, and any conditions declared: Just delete it and build your own solution
#>
#endregion DISCLAIMER