Outlook error "Something unexpected went wrong with this url"

For the GPO to work correctly you need to use three forward slashes before the backslashes to establish the correct protocol.

This was in my example

i.e. for \myfileserver.internal you would use:

file:///\myfileserver.internal in the GPO

Ivan,

You can also apply this fix through the Registry Editor and it will leave the user with access to add/remove sites under the Trusted Sites or Sites in Local Intranet. I tried the fix through GPO first and didn't like that as well.

You'll want to head to HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains in the Registry Editor and add your URL, UNC, or FQDN there. You will still see the Microsoft Security Notice pop up but I think that's a good thing as users should be paying attention to any links they receive and making sure it is a trusted link before opening.

Here is the link to Microsoft's page for IE security zones. Hope this helps.

https://learn.microsoft.com/en-us/troubleshoot/developer/browsers/security-privacy/ie-security-zones-registry-entries

Thank you Gabe!

Rolling back to a previous Office build fixed this for me.

This fix worked for me too.

I used the fix below and that seems to work