Hi all, I'm currently trying to implement an Active Directory client certificate authentication for OWA but I'm experiencing troubles... the server is running a windows 2008 Server with IIS 7.0. I've configured the following: 1. Enable "AD Client Certificate authentication" in IIS Manager -> MyServer -> Authentication 2. "Accept Client Certificate" in IIS Manager -> MyServer -> Sites -> owa -> SSL Settings 3. Enable ClientCertificateMappingAuthentication in IIS Manager -> MyServer -> Sites -> owa -> Configuration Editor This process works for only one user! Other must re-enter username and password...and for both Iexplorer & Firefox. Has someone experienced the same issue? Thanks for your help, Alligat0r

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