Commands › Exchange Online

Disable-MailUser

Exchange Online ExchangeOnlineManagement Disable-*

Remove email capabilities from existing mail users.

Quick start script

# Disable-MailUser — quick start (serv365.ai)
# 1. Connect (app-only shown; interactive: omit the certificate parameters)
Connect-ExchangeOnline -CertificateThumbprint $thumb -AppId $appId -Organization $org

# 2. Capture the current state first — you cannot roll back what you never recorded
$before = Get-MailUser
$before | Format-List

# 3. Make the change (dry run first)
Disable-MailUser -Identity <MailUserIdParameter> -WhatIf
Disable-MailUser -Identity <MailUserIdParameter>

# 4. Verify and diff
$after = Get-MailUser
Compare-Object ($before | Out-String) ($after | Out-String)

Syntax

Disable-MailUser [-Identity] <MailUserIdParameter>
 [-Confirm]
 [-DomainController <Fqdn>]
 [-IgnoreDefaultScope]
 [-IgnoreLegalHold]
 [-WhatIf]
 [<CommonParameters>]

Parameters (6)

Parameter	Type	Required	What it controls
-Identity	MailUserIdParameter	yes	The Identity parameter specifies the mail user that you want to mail-disable. You can use any value that uniquely identifies the mail user. For example:
-Confirm	SwitchParameter		The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on whether the cmdlet requires confirmation before proceeding.
-DomainController	Fqdn		The DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory. You identify the domain controller by its fully qualified domain name...
-IgnoreDefaultScope	SwitchParameter		The IgnoreDefaultScope switch tells the command to ignore the default recipient scope setting for the Exchange PowerShell session, and to use the entire forest as the scope. You don't need to specify a value with this switch.
-IgnoreLegalHold	SwitchParameter		The IgnoreLegalHold switch ignores the legal hold status of the user. You don't need to specify a value with this switch.
-WhatIf	SwitchParameter		The WhatIf switch shows what the command does without making any changes. You don't need to specify a value with this switch.

Reference facts derived from Microsoft documentation, © Microsoft, licensed CC BY 4.0; restructured with original guidance by serv365.ai.