In the Trust Center window, click on settings.In the Outlook options window, click on Trust Center → Trust Center Settings → Email Security.In Outlook 2013, click on File and then on Options.Sst = Get-Content SMIMECertificateIssuingCA.sst -Encoding Byte Set-SmimeConfig -SMIMECertificateIssuingCA Add email signature to Global Address List Use the command below to update the SST on the office 365 exchange server via the remote PowerShell: Click the right mouse button, select All Tasks → Export… and save the file in Microsoft Serialized Certificate Store (SST) format.Select the root and intermediate certificates that belong to the personal signature.Close the Add Standalone Snap-in box by clicking OK on the Add/Remove Snap screen.Select My user Account and click Finish.Select Certificates from the available snap-ins box and click Add.Click on File and select Add/Remove Snap in.Click menu Start → Run and type mmc followed by Enter.SST file for root and intermediate certificatesįollow the following steps to open the Local Machine Certificate Store via the mmc snap-in:
To use an e-mail certificate outside of Office 365, install the certificate in the relevant e-mail client. Note: This manual is only for Office 365.
To enable the use S/MIME for signing and encrypting e-mail within Office 365, it is necessary to install a digital signature (e-mail certificate) in the form of an SST file in the Exchange Online environment.
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