Public folders are a feature of Microsoft Exchange that let people in an organization share messages, calendars, and address books. After you subscribe to a public folder, the folder appears in the navigation pane and you can access its contents.

Subscribe to an Exchange public folder

1. On the Tools menu, click Public Folders.

2. In the left pane, under Public Folders, click the Exchange account that you want.
A list of public folders appears. Mail folders are represented by the  icon, calendars show the  icon, and address books show the  icon. Folders to which you are already subscribed are displayed in bold.
3. Click the folder that you want to subscribe to, and then click Subscribe  .
The subscribed folder appears in the navigation pane under Subscribed Public Folders.

4. To view the contents of the folder, click the folder in the navigation pane. 
Messages or contacts in the folder appear in the item list. Or, if the folder is a calendar folder, events appear on the calendar.

Send a message to a public mail folder

1. At the bottom of the navigation pane, click Mail.

2. On the Home tab, click New Email.

TIP: The keyboard shortcut to create a new email message is   + N .

3. Add the folder's email address in the To box, and then create and send the message.

NOTE: If a public folder does not have an email address assigned to it, you cannot use Outlook 2016 for Mac to post a message in the folder.
NOTE: To view your subscribed public folders, in the navigation pane, click Subscribed Public Folders.

Add a meeting or an appointment to a public calendar folder

1. At the bottom of the navigation pane, click Calendar.

2. In the navigation pane, click the arrow next to Subscribed Public Folders, and then click the calendar that you want.

3. On the Home tab, click Appointment or Meeting.

4. Enter the details about the event, and then send or save it.

Add a contact to a public address book folder

1. At the bottom of the navigation pane, click People.

2. In the navigation pane, click the arrow next to Subscribed Public Folders, and then click the address book folder that you want.

3. On the Home tab, click New Contact.

4. Enter the details about the contact, and then save it.