WE installed exchange 2010 server and external owa url is worked but we type the full owa url as per the https://mail.lexgyan.com/owa
It shows the IE certificate error bar.But that certificate when we installed in IE in the trusted root cert Auth, that certificate is showing installed in IE but when we search in IE that certificate is not finding.
when we export from the other browser and installed in IE. It show Red bar in IE browser
Because of this certificate we can't installed the outlook account on desktops.
Here we attached the file for the reference.
1)we need the certificate is valid and how to validate for external users to configure their outlook accounts.
Suggest for above issue.