Updating exchange certificate
For simplicity, it is recommended to install same certificate. mail.domain name will be used by both internal and external users. Under Group or user names, click Edit button to change permission. You can see there are three default certificates already created. WMSVC is a self-signed certificate and is necessary for remote management of web server. We want to install a public certificate not self-signed certificate. For autodiscover service, autodiscover.domain name will be used. Click Add add to add Exchange Trusted Subsystem group. Choose create a request for a certificate from a certification authority option.
Verification instruction are also sent in the same email. Once you get the certificate in your inbox, download it on the same shared folder. It is used to integrate applications such as Office Online Server (OOS), Share Point, Lync, and Exchange Online.