OWA was written to only decrypt messages on your own machine, not on the mail server. (Mostly due to the obvious – the mail server doesn't have your decryption key.) For this, it needs an ActiveX 'control' to be installed, which only works in Internet Explorer. If you do not have or don't want to use Internet Explorer, try configuring a desktop email client such as Thunderbird, Windows Live Mail, or MS Office Outlook – all of them support S/MIME. How to set language option in spelling and grammar in microsoft word for mac version 15.33. (Most of them require that the server have IMAP enabled, however.).

Configuring S/MIME certificate for Apple Mail on Mac OSX....17. Access via Internet Explorer, OSX with Apple Mail, OSX with Outlook, iOS with Apple Mail. The 'Download the S/MIME control' link. Configuring Outlook Web Access 2003 for S/MIME Security. With Exchange Server 2003, Microsoft added the S/MIME feature to Outlook Web Access using a control. It relies on the interaction of the Web browser and the Exchange server to provide full functionality.