Only connect if Proxy Server certificate has this principal name

UserNeeds changes for IntuneL_RPCProxyServerPrincipalName

Supported on SUPPORTED_Windows7 (defined in the Windows templates)

5568.1000

What it does

This policy setting specifies the required certificate principal name for the RPC proxy server for Outlook Anywhere. If you enable this policy setting, you must enter a server principal name. You must precede the server name with "msstd:" for this configuration to work. For example, you would enter the following text if the server principal name is mail.fourthcoffee.com: msstd:mail.fourthcoffee.com If you disable or do not configure this setting, Outlook uses the certificate principal name that is specified in Autodiscover.

What it writes

Hive: HKEY_CURRENT_USER
Registry key: software\policies\microsoft\office\16.0\outlook\rpc

Why it needs changes for Intune

Policy references a Windows supportedOn definition.
ADMX-INTUNE-WINDOWS-SUPPORTEDON-REFERENCE

Options

Option	Type	Registry value	Allowed values
Specify the proxy server principal name (see Explain tab for details)Required	Text	`proxyserverprincipalname`	Up to 255 characters

Configure and deploy

Choose a state and the option values; the output below is generated from the template for exactly that.

Fix the highlighted options to generate output.

History 1 retained release

5568.100010 Aug 2026
- Already present in the first release ChangeIntel keeps.

Template

Internal name: L_RPCProxyServerPrincipalName
Namespace: outlk16.Office.Microsoft.Policies.Windows
Template file: outlk16.admx
Release: Microsoft 365 Apps 5568.1000 · file set 8be05d876aae137d…

Definition, editor controls and support

Definition

<policy class="User" displayName="$(string.L_RPCProxyServerPrincipalName)" explainText="$(string.L_RPCProxyServerPrincipalNamePolicyExplain)" key="software\policies\microsoft\office\16.0\outlook\rpc" name="L_RPCProxyServerPrincipalName" presentation="$(presentation.L_RPCProxyServerPrincipalName)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="outlk16.Office.Microsoft.Policies.Windows:L_Exchangesettings" />
      <supportedOn ref="Microsoft.Policies.Windows:SUPPORTED_Windows7" />
      <elements>
        <text expandable="true" id="L_RPCProxyServerPrincipalNameTextID" required="true" valueName="proxyserverprincipalname" />
      </elements>
    </policy>

Editor controls

<presentation id="L_RPCProxyServerPrincipalName" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
        <textBox refId="L_RPCProxyServerPrincipalNameTextID">
          <label>Specify the proxy server principal name (see Explain tab for details):</label>
        </textBox>
      </presentation>

Supported platforms and category

outlk16.Office.Microsoft.Policies.Windows:category:L_Exchangesettings
<category displayName="$(string.L_Exchangesettings)" name="L_Exchangesettings" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="outlk16.Office.Microsoft.Policies.Windows:L_ToolsAccounts" />
    </category>
outlk16.Office.Microsoft.Policies.Windows:category:L_MicrosoftOfficeOutlook
<category displayName="$(string.L_MicrosoftOfficeOutlook)" name="L_MicrosoftOfficeOutlook" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
outlk16.Office.Microsoft.Policies.Windows:category:L_ToolsAccounts
<category displayName="$(string.L_ToolsAccounts)" name="L_ToolsAccounts" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="outlk16.Office.Microsoft.Policies.Windows:L_MicrosoftOfficeOutlook" />
    </category>
outlk16.Office.Microsoft.Policies.Windows:unresolved:Microsoft.Policies.Windows:SUPPORTED_Windows7
<unresolved reference="Microsoft.Policies.Windows:SUPPORTED_Windows7" />
outlk16.Office.Microsoft.Policies.Windows:category:L_Exchangesettings
<category displayName="$(string.L_Exchangesettings)" name="L_Exchangesettings" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="outlk16.Office.Microsoft.Policies.Windows:L_ToolsAccounts" />
    </category>
<strings><string id="outlk16.Office.Microsoft.Policies.Windows:L_Exchangesettings">Exchange</string></strings>
outlk16.Office.Microsoft.Policies.Windows:category:L_MicrosoftOfficeOutlook
<category displayName="$(string.L_MicrosoftOfficeOutlook)" name="L_MicrosoftOfficeOutlook" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="outlk16.Office.Microsoft.Policies.Windows:L_MicrosoftOfficeOutlook">Microsoft Outlook 2016</string></strings>
outlk16.Office.Microsoft.Policies.Windows:category:L_ToolsAccounts
<category displayName="$(string.L_ToolsAccounts)" name="L_ToolsAccounts" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="outlk16.Office.Microsoft.Policies.Windows:L_MicrosoftOfficeOutlook" />
    </category>
<strings><string id="outlk16.Office.Microsoft.Policies.Windows:L_ToolsAccounts">Account Settings</string></strings>