This article applies to iPhone/iPad users who have set up their Exchange Account via ActiveSync and enabled Contacts sync.

To find the address in GAL do the following:

  1. Contacts > Groups.

    contacts

  2. Select Exchange Global Address List.
    All Exchange represents personal Outlook Contacts and groups, Skype for Business Contacts and Suggested Contacts that are not a part of GAL.
    Global Address List
  3. Start typing a name of the person or email address you are looking for. Enter Search.
    GAL lookup

Read the Knowledge Base article on How Do I Create New Contacts In The Global Address List (GAL) In Exchange?