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You have to be a delegate for calendars before it will appear in Outlook for Mac. This is a limitation of EWS (the protocol Outlook for Mac uses to connect to Exchange) and is considered by design. The person sharing the calendar needs to provide you delegate access to their calendar before the non-default shared calendar will appear. To open the shared calendar, follow these steps: On the File menu, point to Open, and then select Other User's Folder. Select Find User. Type the name of the person who granted you access, select Find, select the person's name, and then select OK. This wikiHow teaches you how to add calendars to Outlook. Outlook did away with its calendar sync tool years ago. However, you can add shared calendars to Outlook, use iCal addresses to add a Google calendar, and iCloud for Windows can configure Outlook to add an Apple Calendar to Outlook.

Original KB number: 4025591

Symptoms

You try to add an Internet calendar in Microsoft Outlook 2016, Outlook 2019, or Outlook for Office 365 by following these steps:

1. Switch to the calendar module.
2. In the Manage Calendars group on the toolbar, select Open Calendar.
3. Select the From Internet option.
4. Provide the path of your Internet calendar file.
5. Select OK.

When you use this method for some Internet servers, the calendar is not added successfully. After a progress window opens briefly, you are returned to the calendar module without a new calendar added. Additionally, you don't receive any error message.

Cause

Cant Log Into Shared Calendar On Outlook For Macbook Pro

By default, Outlook 2016, Outlook 2019, and Outlook for Office 365 use a new modern authentication stack. Even if the Internet calendar file that you are trying to open does not require authentication, Outlook broadcasts its ability to do modern authentication on the server that contains the calendar. Most server software responds to this broadcast by supporting modern authentication. However, some servers consider the broadcast to be an invalid client request. Therefore, they return a response that causes Outlook to cancel the attempt to add the calendar.

For example, server software that's running on Amazon Web Services (AWS) may consider the authentication broadcast to be invalid and refuse the connection.

Workaround

To work around this issue, use Outlook Web App (OWA). OWA doesn't have this authentication header behavior. Therefore, it will successfully open the Internet calendar that you want to add.

To use OWA to add the calendar, follow these steps:

1. Sign in to OWA.
2. Switch to the Calendar module.
3. Select the Add calendar menu.
4. Select the From internet option.
5. Provide the URL and an optional calendar name.
6. Select Save.

More information

When you add the Internet calendar by using OWA, the server that's running Exchange Server manages the calendar subscription and updates. Calendar updates sync approximately every four hours.

The calendar that's added from OWA does not appear in the Outlook desktop application as an Internet calendar. Instead, it is displayed as a calendar entry in the Other Calendars group. Because no subscription information is handled or controlled by the Outlook desktop application, you don't have to configure any client-side Internet calendar options for the calendar that's added through OWA.

Third-party contact disclaimer

Cant Log Into Shared Calendar On Outlook For Mac Os

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

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Original KB number: 3007307

Symptoms

When you open your Calendar in Microsoft Outlook 2016 for Mac, the Open Shared Calendar button on the ribbon is unavailable.

Additionally, when you point to Open on the File menu, the Calendar option is unavailable.

Cause

This issue occurs if the Group similar folders, such as Inboxes, from different accounts check box is selected and the Hide On My Computer folders check box is cleared in General Preferences.

Workaround

Cant Log Into Shared Calendar On Outlook For Mac Osx

To work around this issue, use one of the following methods:

• Select the Exchange folder in My Calendars.

  1. Open the calendar.

  2. Expand My Calendars to display the Exchange mailbox calendar, the On My Computer calendar, and calendars that are associated with any other accounts that are open in Outlook for Mac.

  3. Select the Exchange check box.

     After you do this, the Open Shared Calendar button on the ribbon is available.

• Open another user's Calendar.

  1. On the File menu, point to Open, and then select Other Users Folder.

  2. Search for and then select the user whose calendar you want to open.

  3. In the Folder Type box, select Calendar.

  4. Select Open.

• Change the preferences settings that are related to the On My Computer folders.

  1. On the Outlook menu, select Preferences.
  2. Select General.
  3. Clear the Group similar folders, such as Inboxes, from different accounts check box.
  4. If you want, select the Hide On My Computer folders check box.

Cant Log Into Shared Calendar On Outlook For Mac Outlook

More information