Support for client certificates

Please add support for requesting client certificates for HTTPS (webmail, EWS, ActiveSync, WebDAV and administration) and implement support for it in the Outlook Connector. It would need to be able to ask for a smartcard (or YubiKey), I think the best way would be to use the Windows certificate store, Windows can ask for a smartcard and PIN.
IMAPS, LDAPS, NTTPS and XMPPS would also be nice to have.

This would make Kerio Connect a viable replacement for Exchange Server, which Microsoft seems to be abandoning.