Hello Is there a way to sort the GAL not by Firstname Lastname in Exchange 2010? Or a Workaround to replace the Standard GAL with another List where the Order is correct? I know there is a way to reformat the Displayname in the Active Directory. But this is not acceptable for us because it affects other systems (e.g. sharepoint).

Hi, Have a look into this article it might help : http://exchangeshare.wordpress.com/2008/08/17/exchange-2007-display-name-format/Ripu Daman Mina | MCSE 2003 & MCSA Messaging

Hi Ripu Yes I know that it is possible with changing the Displayname. I also know how to change the displayname. But we can not do that because the displayname is widely used in the microsoft space (e.g. sharepoint). Is there no other way than changing the displayname?

No i dont think thats posible.