GNOME Bugzilla – Bug 626122
Unable to decrypt s/mime-encrypted messages from Outlook 2010
Last modified: 2011-08-03 08:01:47 UTC
Forwarding this from a Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=620804 Apparently Outlook 2010 "more fully implements the S/MIME RFC," but breaks s/mime communication with other email clients. See this MS resource for more information: http://support.microsoft.com/kb/2142236
This issue is fixed in Microsoft Office 2010 Service Pack 1 (SP1). If you cann't install Office 2010 SP1, you can apply work around which is mentioned on MS knowledge base http://support.microsoft.com/kb/2142236