I’ve started getting this question on a regular basis, so I thought it was time to post the how-to for it. More and more people are beginning to use mobile devices that support Exchange ActiveSync, and it’s more than just the PocketPC crowd. SBS provides a self-signed SSL certificate for secure web transactions, and most devices will not recognize the self-signed certificate, so you have to install the certificate into the store on the device before ActiveSync will work with Exchange. But the issue is not limited to the self-signed certificates, either. Some third-party certificates are not recognized as valid by some devices and also must be installed in the certificate store on the device before ActiveSync will work.

While there are a few different ways to transfer the certificate to a mobile device, I have had 100% success with the following method each time I have used it. Hopefully it will be of use to you, whether you have the self-signed SSL cert from SBS or a third-party cert that is not recognized as valid by all mobile devices.
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