My first lesson on Windows Phone 7. One one of my lab exchange servers I have a privately CA signed  certificate and to get ActiveSync going on a phone you need to import the CA cert, right.

So how do we do this on a Windows Phone 7 device?

1. First on you’re locale Client (PC, Laptop) open the mmc and load the snap-in for Certificates, select Local computer;
   Go to Trusted Root Certification Authorities – Certificates
   Find your RootCA Certificate
2. Export this Certificate as a DER-coded-binary X.509 (CER) on your local Computer
3. Send it via Mail (another Mail-account Hotmail for example) to you’re WP7
4. Sync the Mail Box and open the attachment
5. Install this Certificate by open it from the device
6. Restart the device
7. Now test you’re Sync with the EAS Account