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An invalid certificate error when opening MS Outlook 2010

By [email protected] and EM @QUE.com
An invalid exchange server certificate appearing when you start the MS Outlook 20007 or 2010. For example, the web server fully qualified domain name is webmail.whaddya.com.

Background:
Before Office365 hosting our email address (mailboxes), we used webmail.whaddya.com for our Outlook Web Access (OWA) and we bought a SSL certificate to provide secure connection from workstation to server.

I transitioned our email using Office365, so the old Exchange Server and website webmail.whaddya.com is no longer active, so as the SSL expired after a year.

Then, an invalid server certificate now appearing when I started the MS Outlook 2010 application. The MS Outlook still see that webmail.whaddya.com though I am now using Office365 service. Similar to Internet Explorer, the cache records still exist.

To remove the old data e.g. webmail.whaddya.com, follow this guide.
  • Open Regedit
  • Go to HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\AutoDiscover
  • Right click on AutoDiscover, New, DWORD 32-bit value
  • Value name: ExcludeScpLookup
  • Value data: 1
  • Base: Hexadecimal
Click OK to finish.

Close MS Outlook, and re-open again to check if the invalid certificate is gone.

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