Search is used to quickly find specific accounts, aliases, distribution lists, resources on the domain and you can search for a specific domain. The drop-down arrow at the left of the search box allows you to select which type of items to search for.
For accounts, you can search by display name, first name, last name, first part of the mail address, alias, delivery address, or mailbox ID. If you search using a mailbox ID, the complete ID string must be entered in the search.
If you do not know the complete name of the type, you can enter a partial name. Any search within the type selected with that partial sequence in the name are displayed. For example, if you searched for Sam in Accounts, the results could include Samuel, Samantha, Sammy, Samson.
From the drop-down arrow next to the search box, select what type of search to perform.
In the Search box, enter the name or partial name or string
Click Search.
Matching types are displayed in the content pane.