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Outlook account error: "messaging interface returned an Unknown error. If problem persists restart Outlook"

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I have this situation:

Exchange Server is 2010; Outlook 2007 on Windows-7:

UserA email account gives “messaging interface returned unknown error. Restart Outlook” when I select "digital signature and/or encryption" with a good user certificate, when Sending an email.
This error  definitely is related to profile/data-file since it's localized to this user.  Recreating profile does not fix it. I deleted the data file outlook.ost and restart outlook, new outlook.ost was created. Problem still remains.
Other user accounts can send email signed/encrypted.  But UserA cannot sign/encrypt.  It will send plain email without email security.   Several online suggestions have not solved the problem yet. Any other suggestion will be appreciated.


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