I have a user who would like to know why his from and to fileds in his outlook inbox displays in different ways. Sometimes he only gets the user name, sometimes the fully email address, and sometimes the user name with the email address in brackets. I've checked to see whether this happens for internal company users only or not, but there seems to be no pattern. Below is an example where Joe Blogs works for abc.com
From To Subject
Joe Blogs Marge@company.com
Joe Blogs Adam Smith (firstname.lastname@example.org)
Silvya.Plath@xyz.com Joe Blogs
Adam Smith Joe Blogs
Joe Blogs Adam Smith
How does Outlook decide how to display each of these users/addresses?
Any help kindly appreciated.