If you have already configured Outlook for S/MIME, you can use the following steps to export a digital certificate.
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Open Outlook.
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Select File > Options > Trust Center > Trust Center Settings.
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Select Email Security.
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Under Digital IDs, select Import/Export.
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Select Export Your Digital ID to a file.
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Choose Select and then select the correct certificate.
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Select Browse and choose a location to save the file.
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Enter your password and then click OK.
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Create a new email message and attach the exported PFX file. You can then send the email message to yourself.