Stuart Breckenridge

Signing Emails with Outlook 2013 on Windows 10

For outgoing email I always sign with a digital signature. After installing Windows 10 and Office 2013 I added my certificate, but every time I attempted to send an email I got an error which stated:

“A required action was not successful because of an unspecified error.”

The Windows Error Department

Not even slightly helpful. I tried everything: from running as administrator to installing Outlook 2015 on the Mac and testing the certificate there. It was only an issue with Outlook 2013 on Windows 10.

It turns out the fix is pretty strange:

  1. With Outlook not running, fire up Command Prompt as an administrator.
  2. Type sfc /scannow1, and hit Enter.
  3. Wait till this completes…
  4. Open Outlook and send signed emails.
  1. System File Checker is a utility in Windows that allows users to scan for corruptions in Windows system files and restore corrupted files. ↩︎