S/MIME support for Outlook on the Web (OWA) in Google Chrome or Microsoft Edge – HowTo-Outlook

S/MIME defend for Outlook on the Web ( OWA ) used to be only available in Internet Explorer but it is now besides potential to add this to Google Chrome and the new Microsoft Edge browser. however, adding the ask extension international relations and security network ’ metric ton ( presently ) possible via the traditional means of using the Chrome Web Store or the Microsoft Edge Addons page. This lead explains how you can manually install or deploy the Microsoft S/MIME Control for Outlook on the world wide web.

Infobar message when trying to open an S/MIME message in OWA. Note:
This lead applies to the new Microsoft Edge which is based on the same render engine as Google Chrome. You can recognize it by the new picture shown on the right, rather of the traditional blue “ vitamin e ” picture .

Step 1: Install the S/MIME extension

As mentioned, the Microsoft S/MIME propagation can ’ deoxythymidine monophosphate be installed from the browser store like other extensions. alternatively, you ’ ll have to configure the browser to install it automatically by deploying a Registry prize or Group Policy. The Registry method might be the easiest method acting for testing, but the Group Policy method is the commend way to go for corporate administrators. Either method has the lapp result as the Group Policy sets the exact lapp Registry value. After applying a method, restart the browser and after a little while, you ’ ll see the Outlook icon next to the Address Bar to indicate that the propagation has been installed. The reference will besides be listed by opening the Menu in Chrome or Edge and choosing “ Managed by your organization ” or by going to the following foliate in chrome : //management or border : //management. Important!
For either method, it is required that the target calculator is domain-joined. The extension is mechanically blocked by both Google Chrome and Microsoft Edge when the calculator is not domain-joined .

Method 1: Registry

To have the browser install the Microsoft S/MIME extension, you ’ ll have to set the ExtensionInstallForceList measure in the Registry. Below you ’ ll find the localization for both Microsoft Edge and Google Chrome. Key Microsoft Edge : HKEY_CURRENT_USER\Software\Policies\Microsoft\Edge\ExtensionInstallForcelist Key Google Chrome : HKEY_CURRENT_USER\Software\Policies\Google\Chrome\ExtensionInstallForcelist Value name : 1
Value type : REG_SZ Value Office 365 : maafgiompdekodanheihhgilkjchcakm;https://outlook.office.com/owa/SmimeCrxUpdate.ashx Value Exchange On-Premises : maafgiompdekodanheihhgilkjchcakm;https:///owa/SmimeCrxUpdate.ashx
Setting the ExtensionInstallForcelist rate in the Registry Editor to install the S/MIME extension .

Method 2: Group Policy

To set the register rate above, you can besides use the Group Policy templates. For instructions on how to install and use Group Policy templates you can use the lead ; Setting Outlook Group Policies. You can find the policy set in the watch location ;

• Google Chrome
  User Configuration-> Administrative Templates-> Google-> Google Chrome-> Extensions-> Configure the list of force-installed apps and extensions
• Microsoft Edge
  User Configuration-> Administrative Templates-> Microsoft Edge-> Extensions-> Control which extensions are installed silently

Set the policy setting to Enabled the and click on the “ Show… ” release to add the following respect ;

• Office 365
  maafgiompdekodanheihhgilkjchcakm;https://outlook.office.com/owa/SmimeCrxUpdate.ashx
• Exchange On-Premises:
  maafgiompdekodanheihhgilkjchcakm;https:///owa/SmimeCrxUpdate.ashx

Setting the ExtensionInstallForcelist value in the Group Policy Editor to install the S/MIME propagation .

Step 2: Configure the S/MIME extension

When you are using a postbox hosted in Office 365 or Outlook.com, you can skip this step. When you are using a postbox hosted in an On-Premises Exchange environment, then you must add the Outlook on the Web world to the “ Allowed domains ” list.
Infobar message when using the S/MIME Extension in an On-Premises Exchange environment. To do this, cluck on the “ snap hera ” liaison in the infobar message or cluck on the Outlook picture veracious from the Address Bar and choose : reference Options. Another way to get to the Extension Options page of the S/MIME extension is by going to the trace page ;

• Google Chrome
  chrome-extension://maafgiompdekodanheihhgilkjchcakm/Options.html
• Microsoft Edge
  extension://maafgiompdekodanheihhgilkjchcakm/Options.html

Add your On-Premises mail world to the S/MIME Control options .

Step 3: Download and install the S/MIME control

After installing the extension, you ’ ll poster that you however won ’ metric ton be able to open S/MIME code messages. The infobar however has changed and instructs you to install the S/MIME control and contains a connection to download this control. For Office 365, this connect presently point to here but that can change in the future. For Exchange On-Premises, it points to ;
https:///owa/smime/SmimeOutlookWebChrome.msi This radio link can besides be found in the S/MIME Settings section of the Options page in Outlook on the web. Instructions for getting to this extra options page are in Step 4. Because this S/MIME see installer is actually intended for deployment, the initiation of this package is silent and doesn ’ triiodothyronine give any feedback whether the facility was successful or not. You can however however install it manually and it doesn ’ t ask administrator permissions to install it for most knowledge domain configurations. Give the installer a good minute to complete. When it installed successfully, it will besides show in your Apps number in Windows Settings. once installed, restart the browser and you should be able to read and send S/MIME code emails ampere well as adding digital signatures to emails. The infobar will show the following information when the message can be decrypted and the digital signature can be verified ;

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