We are in the process of migrating to Exchange 2013, and I have been asked to find the answer to a question.
We create multiple email addresses for users, these include alias@domain.com and firstname.lastname@domain.com. the firstname.lastname one is where the question arises as this has previously been used as the primary, but we now need to start using autodiscover so the primary is going to be the alias so it matches the UPN.
Previous setup has been done manually, so any name duplication (2 people called John Doe) has been dealt with by the administrator. Going forward we are going to have things done automatically, and we need to know how Exchange would handle this duplicate name. What would it do for the second person called John Doe? What firstname.lastname email address would be created?