Commands › Exchange Online
Disable-UMMailbox
Disable Unified Messaging (UM) for UM-enabled mailboxes.
Quick start script
# Disable-UMMailbox — 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-UMMailbox
$before | Format-List
# 3. Make the change (dry run first)
Disable-UMMailbox -Identity <MailboxIdParameter> -WhatIf
Disable-UMMailbox -Identity <MailboxIdParameter>
# 4. Verify and diff
$after = Get-UMMailbox
Compare-Object ($before | Out-String) ($after | Out-String)Syntax
Disable-UMMailbox [-Identity] <MailboxIdParameter>
[-Confirm]
[-DomainController <Fqdn>]
[-IgnoreDefaultScope]
[-KeepProperties <Boolean>]
[-WhatIf]
[<CommonParameters>]Parameters (6)
| Parameter | Type | Required | What it controls |
|---|---|---|---|
| -Identity | MailboxIdParameter | yes | The Identity parameter specifies the mailbox that you want to disable for Unified Messaging. You can use any value that uniquely identifies the mailbox. 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. | |
| -KeepProperties | Boolean | The KeepProperties parameter specifies whether to keep or remove the UM properties for the mailbox. Valid values are: | |
| -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.