Our exchange 2010 system has a large number of custom contacts for the self employed agents we work with.
Our mail clients (exchange 2010 and owa) used to display the name of the custom contact in the from field of a received email but its now displaying the email address or the from name the sender has configured.
When we send an email names/email addresses get resolved and show the name from the custom contact as expected so the Global Address List is fine.
James Smith sends an email from james.smith@madeupaddress.
we have a custom contact with an external email address of james.smith@madeupaddress.
ext and display name of Agent Smith
What should show in outlook is that the email is from Agent smith but what we see is James Smith.
So What changed?
Last week we started the process of finally decommissioning our exchange 2003 server. All the mailboxes moved a long time ago but we completed the steps in the link below of converting all the objects to 2010 and some part of that seems to have caused this issue.