How to Disable Exchange Client Certificates

Hey Everyone,
First of all, I just want to say that I'm a long-time reader, first-time writer. :)

Anyhow, I'm trying to disable the Exchange client certificates so that I may wirelessly synchronize my Windows Mobile 5 device.  I have the device configured properly, but when I go to synchronize, I get the following error:

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Result:
The Exchange Server requires certificates to log on.  Connect your device to your PC on the corporate network to obtain a certificate.
Support code:  0x85030027
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I have installed ActiveSync on my corporate workstation and synchronized, but I still get the same error when switching back to Exchange ActiveSync.

Also, when I bring up my Outlook Web Access site, I get a "Choose a digital certificate" dialog box with no options to select, so I always just click "OK", and it takes me to the site.

Any ideas how I can fix this?

Thanks in advance!

Since the answer to this was not easily Googled, I'm going to assign a "difficult" rating to this.