Released: February 2026 Exchange Server Security Updates

I had the issue and the official scripts didn’t help at all — they didn’t fix anything. I always restart the server before applying anything, disable the AV, put it into maintenance mode, and run as Administrator via Command Prompt.

I ended up creating a script that initializes things, and just to be safe I also ran the CAS rebuild:

#learn.microsoft.com/en-us/troubleshoot/exchange/client-connectivity/owa-stops-working-after-update

cd "C:\Program Files\Microsoft\Exchange Server\V15\Bin"

.\UpdateCas.ps1

.\UpdateConfigFiles.ps1

iisreset /restart

PS C:\Windows\system32> cd "E:\Program Files\Microsoft\Exchange Server\V15\Bin"

PS E:\Program Files\Microsoft\Exchange Server\V15\Bin> Add-PSSnapin Microsoft.Exchange.Management.PowerShell.Setup -ErrorAction SilentlyContinue

PS E:\Program Files\Microsoft\Exchange Server\V15\Bin> .\ServiceControl.ps1 AfterPatch

WARNING: 'FMS' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'hostcontrollerservice' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'IISAdmin' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeADTopology' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeAntispamUpdate' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeDagMgmt' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeDelivery' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeDiagnostics' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeEdgeSync' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeFastSearch' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeFrontendTransport' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeHM' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeHMRecovery' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeIMAP4' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeIMAP4BE' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeIS' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeMailboxAssistants' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeMailboxReplication' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangePOP3' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangePOP3BE' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeRepl' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeRPC' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeServiceHost' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeSubmission' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeThrottling' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeTransport' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'MSExchangeTransportLogSearch' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'pla' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'RemoteRegistry' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'SearchExchangeTracing' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'W3Svc' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'WinMgmt' did not exist, this is not an error as the sevice might have just been installed

WARNING: 'wsbexchange' did not exist, this is not an error as the sevice might have just been installed

Write-ExchangeSetupLog : The term 'Write-ExchangeSetupLog' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify

that the path is correct and try again.

At E:\Program Files\Microsoft\Exchange Server\V15\Bin\ServiceControl.ps1:669 char:4

+ Write-ExchangeSetupLog -Info $line

+ ~~~~~~~~~~~~~~~~~~~~~~

+ CategoryInfo : ObjectNotFound: (Write-ExchangeSetupLog:String) [], CommandNotFoundException

+ FullyQualifiedErrorId : CommandNotFoundException

# PowerShell (Run as Administrator)

$services = @(

# IIS / Windows

'IISADMIN','pla','W3SVC',

# Exchange (do print)

'MSExchangeADTopology',

'MSExchangeAntispamUpdate',

'MSExchangeDagMgmt',

'MSExchangeDiagnostics',

'MSExchangeEdgeSync',

'MSExchangeFrontEndTransport',

'MSExchangeHM',

'MSExchangeHMRecovery',

'MSExchangeImap4',

'MSExchangeIMAP4BE',

'MSExchangeIS',

'MSExchangeMailboxAssistants',

'MSExchangeMailboxReplication',

'MSExchangeDelivery',

'MSExchangeSubmission',

'MSExchangePop3',

'MSExchangePOP3BE',

'MSExchangeRepl',

'MSExchangeRPC',

'MSExchangeFastSearch', # Microsoft Exchange Search

'HostControllerService', # Microsoft Exchange Search Host Controller

'MSExchangeServiceHost',

'MSExchangeThrottling',

'MSExchangeTransport',

'MSExchangeTransportLogSearch',

'SearchExchangeTracing',

'wsbexchange'

)

foreach ($s in $services) {

$svc = Get-Service -Name $s -ErrorAction SilentlyContinue

if (-not $svc) { Write-Host "Nao existe: $s"; continue }

try { Set-Service -Name $s -StartupType Automatic -ErrorAction Stop }

catch { Write-Host "Falha Set Automatic: $s -> $($_.Exception.Message)" }

try { Start-Service -Name $s -ErrorAction Stop }

catch { Write-Host "Falha Start: $s -> $($_.Exception.Message)" }

}

# Checagem final

Get-Service -Name $services -ErrorAction SilentlyContinue |

Select Name,StartType,Status |

Sort Name |

Format-Table -Auto