Commands › Exchange Online

New-UMMailboxPolicy

Exchange Online ExchangeOnlineManagement New-*

Create a Unified Messaging (UM) mailbox policy.

Quick start script

# New-UMMailboxPolicy — 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-UMMailboxPolicy
$before | Format-List

# 3. Make the change (dry run first)
New-UMMailboxPolicy -Name <String> -UMDialPlan <UMDialPlanIdParameter> -WhatIf
New-UMMailboxPolicy -Name <String> -UMDialPlan <UMDialPlanIdParameter>

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

Syntax

New-UMMailboxPolicy [-Name] <String> -UMDialPlan <UMDialPlanIdParameter>
 [-Confirm]
 [-DomainController <Fqdn>]
 [-WhatIf]
 [<CommonParameters>]

Parameters (5)

Parameter	Type	Required	What it controls
-Name	String	yes	The Name parameter specifies the display name for the UM mailbox policy. The name for the UM mailbox policy can contain as many as 64 characters.
-UMDialPlan	UMDialPlanIdParameter	yes	The UMDialPlan parameter specifies the identifier for the UM dial plan to be associated with the UM mailbox policy. This parameter is the directory object ID for the UM dial plan.
-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...
-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.