We have a new Exchange 2007 server which is all set up and running nicely. Some of our mobile users however cannot connect to the server using the 'Exchange' option built into Windows mobile 6. I use an IPhone, and set that up in minutes and it works really well but the poor Windows Mobile users cannot get their devices set up. Once setup, the phone takes an age trying to connect, then just comes back with a syncronisation error (one guy got an error code 0X80072F17). I'm pretty sure this is down to an SSL certificate on our side, but I need some guidance in how to fault find this, replace the certificate etc...Thanks.