I use Outlook on a few of my machines with my own email server in the backend. This email server is used with a self signed certificate which I am using for about 5 years. To this point I was able to accept the certificate by clicking "Yes" in the dialog shown here:
About 2 weeks ago, on one of my machines, this "Yes" button started to be greyed out which prevents me from connecting to the server completely. On other machines this functionality still works.
what I tried so far
- Validated the certificate. It is valid but self-signed
- I removed office 365 from the impacted machine and reinstalled it. -> no change, "Yes" still greyed out
- Deleted the email account and set it up again -> no change, "Yes" still greyed out
- Clicked "View certificate" and installed the certificate on the impacted machine -> no change, "Yes" still greyed out
what I have not tried yet
- Walk through the registry and delete every entry that contains outlook after uninstalling office 365
- reinstall windows on the impacted machine
Is there anyone who can tell me what I need to do to get this field accessible again so I can use Outlook as usual?
