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Article ID: 6207, created on Mar 31, 2009, last review on May 9, 2014

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When connecting a Windows Mobile 5.0 device to the Exchange Server, a certificate error message appears:

“The security certificate on the server is invalid. Contact your Exchange Server administrator or ISP to install a valid certificate on the server”.  Support code: 0x80072F0D

However, there is a valid certificate installed.  It is signed by "Go Daddy Class 2 Certification Authority".  Outlook and Outlook Web Access work with Exchange Server without any issues.

The problem appears only when connecting to Exchange Server via Active Sync using your Windows Mobile 5.0 device without the AKU2 (Adaptation Kit Update).


If you use your Windows Mobile 5.0 device without the AKU2 installed, GoDaddy’s root certificate and all child certificates are marked as not trusted.  As a result, your Windows Mobile 5.0 device claims an invalid SSL certificate and will not connect to the Exchange Server.


Install GoDaddy's root certificate to your Windows Mobile 5 device using instructions from GoDaddy. Link to

Please find an alternative resolution below:

1.  Open the link to Outlook Web Access in Internet Explorer on your Windows Mobile 5.0 device,   See screen shot below:

Download the file to your desktop.

3.  Upload the file gd-class2-root.cer  to your Windows Mobile 5.0 device using ActiveSync.

4.  Click on gd-class2-root.cer on your Windows Mobile 5.0 device.

5.  Open the window with the text, "You are about to install \My Documents\gd-class2-root.cer, a

     certificate issued by Go Daddy Class 2 Certification Authority.  Do you want to continue?"

6.  Click "Yes" in this window.

7.  Open "Start > Settings > System > Certificates" on your Windows Mobile 5.0 device.

8.  Click on "Root" tab in the bottom menu.

9.  Certificate "Go Daddy Class 2 Certification Authority" should be listed in the certificates list.  See

     screen shot below:

10.  Do a soft reset on your Windows Mobile 5.0 device.

11.  Try to open in Internet Explorer on your Windows Mobile 5.0

       device.   The certificate warning should not be showing.

12.  Configure ActiveSync to synchronize with the Exchange Server.

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