OWA—Address Lookup
When sending messages in OWA, you do not need to use the Global Address List or contacts. You can use address lookup.
When you have a new message open and you are ready to address the message to your recipient, type part of the name of your recipient in the To: field.

Now Click the icon at the top to check the name against the Global Address List or you can press CONTROL+K.

After you click to check the name, if the name is immediately found, the name will become underlined. If the name was not immediately found, then you will need to select the name from a list. If your check names didn't find anything, then adjust the name or look them up directly from the address book.
You now know how to fully leverage the check names.
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You can always call the Help Desk if you have questions: 724-552-2500.