Zimbra and Client Certificates

[Seamaster]

Hi,

I wonder if there's any way to use Client Certificates on the receiving end of Zimbra, e.g. for ZD or the iCal connector. Background is that our company uses personalized client certificates for access from outside the companies network. Most mobile devices are using this just fine with the activesync mechanism, but for the Zimbra provided tools I didn't found that possibility yet.

Did I overlooked it somewhere ?

Thanks
Henning