#############################################################################
# Suppress-Linkstate.ps1
# Using static text file or Get-ExchangeServer, this script will configure
# selected Exchange 2003 servers to suppress Link State to aid in upgrade to
# Exchange Server 2010 environment.
#
# Use this script in accordance to the following Technet article
# http://technet.microsoft.com/en-us/library/aa996728.aspx
#
# Created by
# Bhargav Shukla
# https://www.bhargavs.com
#
# DISCLAIMER
# ==========
# THIS CODE IS MADE AVAILABLE AS IS, WITHOUT WARRANTY OF ANY KIND. THE ENTIRE
# RISK OF THE USE OR THE RESULTS FROM THE USE OF THIS CODE REMAINS WITH THE USER.
#############################################################################
 
function Suppress-Linkstate
{
# Create empty results file or overwrite existing file
"Server Name,SuppressStateChanges,ServiceStopState,ServiceStartState" | Out-File .\results.csv -Encoding ASCII
 
	foreach ($Server in $Servers)
	{
		# Do Nothing if $_ is null
		if ($Server -ne $null)
		{
		# Set server to connect to
		#$Server = "$_"
 
		# Read SuppressStateChanges from servers
 
			# Set Registry Key variables
			$REG_KEY = "System\\CurrentControlSet\\Services\\RESvc\\Parameters"
			$VALUE = "SuppressStateChanges"
 
			# Open remote registry
			$reg = [Microsoft.Win32.RegistryKey]::OpenRemoteBaseKey('LocalMachine', $Server)
 
			# Open the targeted remote registry key/subkey as read/write
			$regKey = $reg.OpenSubKey($REG_KEY,$true)
 
			# Set SuppressStateChanges to 1 if key exists
			if ($regKey -ne $null)
			{
			$regKey.Setvalue('SuppressStateChanges', '1', 'Dword')
 
			# Write changes to registry without closing it
			$regKey.Flush()
 
			# Read and Store SuppressStateChanges value in variable
			$SuppressStateChanges = $regkey.getvalue($VALUE)
 
			# Close the Reg Key
			$regKey.Close()
			}
 
		# Restart SMTP service, the Microsoft Exchange Routing Engine service, and the Microsoft Exchange MTA Stacks service
		#### You must specify a timeout (in seconds) or the script could potentially never end
		$TimeOut = 30
 
		#### This will stop a single service on all servers in sequence
		$ServiceFilters = "(name = 'smtpsvc')","(name = 'resvc')","(name = 'msexchangemta')"
 
 
			$Locator = new-object -com "WbemScripting.SWbemLocator"
			$WMI = $Locator.ConnectServer($Server, "root\cimv2")
		# Stop Service and check for timeout or sucessful stop
			$ServiceFilters | %{
				$ThisFilter = $_
				(Get-WmiObject -Class Win32_Service -ComputerName $Server -filter "$ThisFilter AND state='running'") | %{
					$Service = $_
					$Refresher = new-object -comobject "WbemScripting.SWbemRefresher"
					$FreshObject = $Refresher.Add($WMI,$Service.__RELPATH)
					$Refresher.Refresh()
					$Then = Get-Date
					:Checking Do {
						$Service.StopService() | out-null
						$Refresher.Refresh()
						if (($FreshObject.Object.properties_ | ?{$_.name -eq "state"}).value -eq "Stopped") {
							$ServiceStopState = "Service $($Service.Name) stopped";
 
							# Store result string in a variable
							$result = "$Server,$SuppressStateChanges,$ServiceStopState,$ServiceStartState"
 
							# Write results to file
							$result | Out-File .\results.csv -Encoding ASCII -Append
 
							$ServiceStopState = $null
 
							break :Checking;
						} Else {
							If (((Get-Date) - $Then).seconds -ge $TimeOut){
								$ServiceStopState = "Service $($Service.Name) stop TIMEOUT";
 
								# Store result string in a variable
								$result = "$Server,$SuppressStateChanges,$ServiceStopState,$ServiceStartState"
 
								# Write results to file
								$result | Out-File .\results.csv -Encoding ASCII -Append
 
								$ServiceStopState = $null
 
								break :Checking;
							}
						}
					} While ($True)
				}
			}
 
		# Start Service and check for timeout or sucessful start
			$ServiceFilters | %{
				$ThisFilter = $_
				(Get-WmiObject -Class Win32_Service -ComputerName $Server -filter "$ThisFilter AND state='Stopped'") | %{
					$Service = $_
					$Refresher = new-object -comobject "WbemScripting.SWbemRefresher"
					$FreshObject = $Refresher.Add($WMI,$Service.__RELPATH)
					$Refresher.Refresh()
					$Then = Get-Date
					:Checking Do {
						$Service.StartService() | out-null
						$Refresher.Refresh()
						if (($FreshObject.Object.properties_ | ?{$_.name -eq "state"}).value -eq "running") {
							$ServiceStartState = "Service $($Service.Name) started";
 
							# Store result string in a variable
							$result = "$Server,$SuppressStateChanges,$ServiceStopState,$ServiceStartState"
 
							# Write results to file
							$result | Out-File .\results.csv -Encoding ASCII -Append
 
							$ServiceStartState = $null
 
							break :Checking;
						} Else {
							If (((Get-Date) - $Then).seconds -ge $TimeOut){
								$ServiceStartState = "Service $($Service.Name) start TIMEOUT";
 
								# Store result string in a variable
								$result = "$Server,$SuppressStateChanges,$ServiceStopState,$ServiceStartState"
 
								# Write results to file
								$result | Out-File .\results.csv -Encoding ASCII -Append
 
								$ServiceStartState = $null
 
								break :Checking;
							}
						}
					} While ($True)
				}
			}
		}
	}
}
 
 
#Add Exchange 2010 snapin if not loaded
# Uncomment following four (4) lines if using dynamic list mentioned below
If ((Get-PSSnapin | where {$_.Name -match "E2010"}) -eq $null)
{
Add-PSSnapin Microsoft.Exchange.Management.PowerShell.E2010
}
 
# Uncomment next line if you want to dynamically get Exchange 2003 servers using Exchange 2010 Management Shell
$Servers = (get-exchangeserver | Where-Object {$_.AdminDisplayVersion -like '*6.5*'} | ForEach-Object {$_.Name})
# Comment line above and Uncomment next line if you want to provide list of servers in a text file (one server per line)
# You can't have both of the abovementioned lines uncommented. Please use one of your choice.
# $Servers = Get-Content .\servers.txt
 
$Servers | Suppress-Linkstate