Share your Calendar and Manage Permissions in Outlook

With your Office 365 email account, you can send a sharing invitation to other users so they can view your calendar in their own Calendar list.

How To - Share your Calendar using Outlook
  1. Once you open Outlook, you will find the calendar icon at the bottom left of your screen.
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  2. Click on the Calendar Icon to open the calendar.

  3. After the calendar opens, make sure that you are in the home tab ribbon at the top of your screen.

    Note: If you do not see the ribbon at the top of your screen, click the down arrow towards the top right to expand the ribbon.
  4. From here you will click share calendar.

  5. Select the calendar you would like to share.

  6. A dialogue box will appear. Make sure you are in the permissions tab and click add.

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  7. Select the user or users that you would like to share your calendar with and click add.

  8. Click OK.

  9. Choose which permission you would like to provide to the user, select apply and click OK.

 

Source: https://support.microsoft.com/en-us/help/10157/sharing-calendar-and-contacts-in-office-365