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I transitioned our email using Office365, so the old Exchange Server and website webmail.whaddya.com is no longer active, so as the SSL expired after a year.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