A Quick Steps to Install an SSL Certificate on Microsoft Office 365
A step-by-step guide on installing an SSL Certificate on MS Office 365
The Certificate Authority will verify your details
CA issues an SSL Certificate and sends the SSL Certificate in a .zip file
Quick Steps to Install an SSL Certificate on Microsoft Office 365 using IIS 8/8.5
Open the ZIP file containing your SSL certificate and save the SSL certificate file (yourdomainname.cer) to the desk top of your AD FS server.
Open Internet Information Services Manager.Click “Start,” then type and select “Internet Information Services Manager.”
In IIS Manager, under “Connections,” select your server’s hostname.
4. Under IIS, double-click the “Server Certificates” icon.
5. In the Actions menu, click “Complete Certificate Request” to open the “Complete Request Certificate” wizard.
6. In the wizard, on the “Specify Certificate Authority Response” page, in the “File name containing the certification authority’s response” field, click “…” and find the .cer file that the CA sent you.
7. In the “friendly name” field, enter a name for the certificate to be known by.
Note: This name is not part of the certificate.
8. In the “Select a certificate store for the new certificate” drop-down, select “Personal.”
9. Click “OK.”
You still need to use IIS to assign the certificate to the default website (HTTPS port 443).
Read full SSL Installation Guide of Microsoft Office 365 at here - http://bit.ly/1SvnWmz