how can mac office2011(adrms client) support clientCertificateMappingAuthentication

hi all，

We setup AD、ADCS、ADRMS environment，and upgraded follow"Information Rights Management in Office for Mac 2011 Deployment Guide"

Have config clientCertificateMappingAuthentication for certification and license URL in IIS, it work fine on windows pc with office 2010 or 2007.

On mac office 2011, it can't display the user certificate pickup window, 

but on the same mac pro, i use safari or chrome navigate "https://drm.domain.com/_wmcs/licensing/license.asmx", it can show certificate pickup window and work fine.