See KB article 915438 - http://support.microsoft.com/kb/915438

thanks

--
Chilumba Mubashi

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"manny" <manny@pacificaplumbing.com> wrote in message
news:e9F2HMrYHHA.3848@TK2MSFTNGP02.phx.gbl...
>I just got my dash and I followed the instructions on how to sync it to my
>exchange server but I keep getting the following error:
>
> Result:
> The security certificarte on the server is invalid.
> Contact your exchange Server administrator or ISP to install a valid
> certificate on the server.
>
> support code 0x80072F0D
>
>
> What can I do to solve this problem?
>
> Thanx in advance
>