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Mobile failed to sync with OWA exchange server

I use Moto Q9 (WM 6.5 OS) to sync outlook emails. It used to work well, but in recent week, it broken.

It returns the following error:

Synchronization failed. The security certificate on the server is invalid. Contact your system administrator or ISP to install a valid certificate on the server and try again.

To verify, I check Settings > Security > Certificates > Root. Some root certificates are there, but not with what I am looking for. I guess Exchange server side changed the certificates recently even I was told nothing changed. I called company IT support, and was told the model is not supported.

After several googles and unsuccessful tries, I finally find the solution, and pretty simple. Open the site in Chrome. View the certificate, and export the root (VeriSign Trusted Network in this case) as Base64 encoded X.509 .cer file. Copy the .cer file to the phone and double click. The certificate is imported to mobile successfully, and the problem is fixed.

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