Final answer:
Denise is using the address book in Outlook 2019 to access her company's Microsoft Exchange email server.
Step-by-step explanation:
Denise is using the address book in Outlook 2019 to access her company's Microsoft Exchange email server. The address book is a tool that allows users to store and access contact information of email recipients and other contacts. With the address book, Denise can easily find and select email addresses when composing emails and managing contacts.
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