This article shows an example of results on the iPhone after synchronizing with a mailbox that has a complex subfolder structure.
This screenshot shows an example folder structure in Outlook:
Under Mail on
Under Calendar on the iPhone, you can see all the calendar folders and subfolders in one list. Each calendar has its own color. You can choose to view one calendar or events from all calendars. To view events from all calendars, tap All. You will see appointments displayed in the color that corresponds to each folder's individual color.
Similarly to calendars, the Contacts application syncs all the folders and subfolders and shows them all in one list. Clicking on All Contacts shows all the contacts from all folders and subfolders in one list.
Note: Global Address List cannot be synced to iOS devices. You can only perform GAL lookups as described below.
If you tap on Exchange Global Address list, you can perform a lookup in the company address book (Global Address List, or GAL).
Read the Knowledge Base article on How Do I Perform GAL Lookups Using My iPhone/iPad? for more information.