Applies to: Exchange Online, Exchange Server 2016

This cmdlet is available in on-premises Exchange Server 2016 and in the cloud-based service. Some parameters and settings may be exclusive to one environment or the other.

Use the Update-SiteMailbox cmdlet to trigger a Microsoft SharePoint synchronization. This command synchronizes document content membership and permissions into Microsoft Exchange. You may need to perform this action when troubleshooting document or membership synchronization issues.

For information about the parameter sets in the Syntax section below, see Syntax.

Update-SiteMailbox -Identity <RecipientIdParameter> [-BypassOwnerCheck <SwitchParameter>] [-FullSync <SwitchParameter>] [-Organization <OrganizationIdParameter>] [-Server <String>] [-Confirm [<SwitchParameter>]] [-Target <All | Document | Membership | Maintenance>] [-WhatIf [<SwitchParameter>]]

This example updates the site mailbox MarketingEvents 2013. If you don't specify the target, this triggers both document and membership synchronization. Because the BypassOwnerCheck parameter is used, it isn't necessary to be an owner or member of the site mailbox to run this cmdlet.

Update-SiteMailbox -BypassOwnerCheck -Identity "MarketingEvents 2013"

This example updates the site mailbox WinterHoliday@tailspintoys.com and performs a full synchronization. By default, the update only occurs for synchronization from the last synchronization. This is only applicable to document synchronization

Update-SiteMailbox -BypassOwnerCheck -Identity WinterHoliday@tailspintoys.com -FullSync

If you are running this command against a site mailbox in which you aren't the owner, you need to use the BypassOwnerCheck parameter to run this cmdlet.

You need to be assigned permissions before you can run this cmdlet. Although all parameters for this cmdlet are listed in this topic, you may not have access to some parameters if they're not included in the permissions assigned to you. To see what permissions you need, see the "Site mailboxes" entry in the Sharing and collaboration permissions topic.


Parameter Required Type Description




The Identity parameter specifies the identity of the site mailbox. This parameter accepts the following values:

  • DisplayName

  • SMTP address

  • Name

  • GUID




The BypassOwnerCheck parameter specifies that the user running the command in the Exchange Management Shell isn't a site mailbox owner or member. If you run the command without this parameter and you aren't the site mailbox owner or member, the command doesn't run or return any information.




The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on if the cmdlet requires confirmation before proceeding.

  • Destructive cmdlets (for example, Remove-* cmdlets) have a built-in pause that forces you to acknowledge the command before proceeding. For these cmdlets, you can skip the confirmation prompt by using this exact syntax: -Confirm:$false.

  • Most other cmdlets (for example, New-* and Set-* cmdlets) don't have a built-in pause. For these cmdlets, specifying the Confirm switch without a value introduces a pause that forces you acknowledge the command before proceeding.




The FullSync parameter specifies full sync is expensive and will have a performance impact on the Exchange system.




This parameter is reserved for internal Microsoft use.




This parameter is available only in on-premises Exchange 2016.

The Server parameter specifies the fully qualified domain name (FQDN) or the Microsoft SharePoint server on which the site mailbox is located.




The Target parameter specifies whether to update the SharePoint documents, the site mailbox's membership list or both. This parameter accepts the following values:

  • All

  • Document

  • Membership

If you don't specify this parameter when you run the cmdlet, this parameter value defaults to ALL.




The WhatIf switch simulates the actions of the command. You can use this switch to view the changes that would occur without actually applying those changes. You don't need to specify a value with this switch.

To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types. If the Input Type field for a cmdlet is blank, the cmdlet doesn’t accept input data.

To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn’t return data.