where can I find info regarding the proper way to handle expiring mail certificates?
Here's the problem: our certificates for digitally signing mails expire after a year. If, a week before expiry, I revoke a certificate and create a new one, Outlook complains whenever I open an older mail, signed with a now revoked certificate.
I think this shouldn't be so, since the old mail was signed at a time when the certificate hadn't been revoked yet, so I would think the signature is still perfectly valid. The revoke has a date, so signatures made AFTER the revoke should be invalid, others not. Maybe I'm wrong :-).
Do I need to let the certificate expire, and only then create a new one, without revoke, to prevent Outlook warning me about invalid signatures?
Thanks for your help!