In organization, company may need to use multiple UPN suffixes for their operations. I wrote an article before explaining how to add multiple UPN suffixes to the domain. You can read it from http://www.rebeladmin.com/2015/01/how-to-configure-multiple-user-principal-name-upn-suffixes/
There are situation where you will need to do mass UPN suffix change. One of the recent challenge I face was…
