Configure S/MIME settings in Exchange Server for Outlook on the web
Applies to: Exchange Server 2013
As an administrator for Exchange Server, you can set up Outlook on the web (formerly known as Outlook Web App) to allow sending and receiving S/MIME-protected messages. Use the Get-SmimeConfig and Set-SmimeConfig cmdlets to view and manage this feature in the Exchange Management Shell. To open the Exchange Management Shell, see Open the Exchange Management Shell.
Considerations for Chrome
To use S/MIME in Outlook on the web in the Google Chrome web browser, you (or another administrator) must set up and configure the Chromium policy named ExtensionInstallForcelist to install the Microsoft S/MIME extension in Chrome. The policy value is:
maafgiompdekodanheihhgilkjchcakm;https://<OWAUrl>/SmimeCrxUpdate.ashx where <OWAUrl> is your URL value. For example:
maafgiompdekodanheihhgilkjchcakm;https://mail.contoso.com/owa/SmimeCrxUpdate.ashx. And note that applying this policy requires domain-joined computers, so using S/MIME in Chrome effectively requires domain-joined computers.
For details about the ExtensionInstallForcelist policy, see ExtensionInstallForcelist.
This step is a prerequisite for using Chrome; it does not replace the S/MIME control that's installed by users. Users are prompted to download and install the S/MIME control in Outlook on the web during their first use of S/MIME. Or, users can proactively go to S/MIME in their Outlook on the web settings to get the download link for the control.
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