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I transitioned our email using Office365, so the old Exchange Server and website webmail.whaddya.com is no longer active, so as the SSL expired after a year.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
Close MS Outlook, and re-open again to check if the invalid certificate is gone.
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