New Outlook SharePoint Calendar Sync: Replace classic connected calendars

If you have used classic Outlook for Windows with SharePoint calendars connected through the “Open Shared Calendar” or “Connect to SharePoint” feature, you may notice that these classic connected calendars no longer work in the new Outlook for Windows. Microsoft has replaced the legacy SharePoint calendar connection method with a new sync system that uses the SharePoint site’s built-in calendar list. This article explains how the new Outlook SharePoint calendar sync works, how to set it up step by step, and what to do if you encounter common issues during the transition.

How the New SharePoint Calendar Sync Works in New Outlook

In classic Outlook for Windows, you could connect a SharePoint calendar by opening a shared calendar and entering the SharePoint calendar URL or by using the “Connect to SharePoint” option on the folder pane. This method created a direct connection to the SharePoint calendar list but did not sync changes in real time and often required manual refresh.

The new Outlook for Windows replaces this legacy approach with a modern sync engine that treats the SharePoint calendar as a connected account. When you add a SharePoint site as an account in new Outlook, the calendar list on that site appears as a separate calendar in your Outlook calendar list. Changes made in SharePoint or in Outlook sync automatically in both directions, provided you have the correct permissions.

The new sync method uses Microsoft Graph API and requires that your SharePoint site is hosted on Microsoft 365. On-premises SharePoint Server sites are not supported in the new Outlook calendar sync. Additionally, you must have at least read access to the SharePoint calendar list. If you are using a classic connected calendar that was set up in the old Outlook, it will not appear in new Outlook. You must remove the old connection and add the SharePoint site using the new method.

Prerequisites for the New Sync

Before you begin, confirm the following:

• You are using the new Outlook for Windows version 1.2023 or later.
• Your SharePoint site is a Microsoft 365 group-connected site or a standard team site.
• You have at least Contribute permission to the SharePoint calendar list.
• Classic Outlook for Windows is not running at the same time.

Steps to Add a SharePoint Calendar in New Outlook

1. Open new Outlook and go to Settings
   Click the gear icon in the top-right corner of the Outlook window. Select Accounts from the Settings menu.
2. Add the SharePoint site as a connected account
   In the Accounts pane, click Add Account. From the list of account types, choose SharePoint site. If you do not see this option, ensure your new Outlook is updated to the latest version.
3. Enter the SharePoint site URL
   Type the full URL of the SharePoint site that contains the calendar list. For example: https://yourcompany.sharepoint.com/sites/TeamSiteName. Click Continue.
4. Sign in with your Microsoft 365 credentials
   If prompted, enter your work or school account and password. Complete any multi-factor authentication steps. Outlook will verify your access to the site.
5. Select the calendar list to sync
   After authentication, a dialog shows all calendar lists available on the site. Check the box next to the calendar you want to sync. You can select multiple calendars from the same site. Click Add.
6. Access the synced calendar in Outlook
   The SharePoint calendar appears in the left navigation pane under My calendars with the site name as the calendar group. Click the calendar name to view events. Changes made in SharePoint appear in Outlook within a few minutes.
7. Remove the classic connected calendar if present
   If you previously used a classic connected calendar, right-click the old calendar entry in the left pane and select Delete or Remove from Calendar. This prevents duplicate entries and confusion.

If the SharePoint Calendar Does Not Appear After Adding

“The SharePoint site was added but no calendar shows up”

This happens when the SharePoint site does not contain a calendar list app. In SharePoint, a calendar is a list type called “Calendar.” If the site uses a modern events web part instead of a classic calendar list, the new Outlook sync cannot detect it. To verify, open the SharePoint site in a browser and check the site contents. Look for a list named “Calendar” or a custom calendar list. If none exists, create a calendar list app on the site first. After creating the list, repeat the steps to add the site in Outlook.

“Changes I make in Outlook do not sync to SharePoint”

Two-way sync requires that you have Edit or Contribute permissions on the SharePoint calendar list. If you have Read-only access, you can see events but cannot add or edit them. Check your permissions by opening the SharePoint calendar list in a browser and clicking the gear icon. Select List settings and then Permissions for this list. If your name shows Read, contact your SharePoint administrator to request Contribute or Edit permissions. Also confirm that the calendar list is not set to read-only at the site level.

“I see duplicate calendar entries after adding the site”

Duplicate entries occur when the classic connected calendar is still present in your Outlook profile. The new sync pulls events from the same SharePoint list, so both calendars display the same data. Remove the old classic connected calendar by right-clicking its name in the left pane and selecting Delete or Remove from Calendar. If you cannot see the old calendar, check the Other calendars section in the navigation pane. After removal, the duplicate events disappear within one sync cycle.

Classic Connected Calendar vs New Outlook SharePoint Sync: Key Differences

Item	Classic Connected Calendar	New Outlook SharePoint Sync
Sync direction	One-way (SharePoint to Outlook) with manual refresh	Two-way automatic sync
Setup location	File > Account Settings > SharePoint Lists	Settings > Accounts > Add Account > SharePoint site
Supported SharePoint type	On-premises and Microsoft 365	Microsoft 365 only
Calendar list requirement	Classic calendar list app	Classic calendar list app (modern events web part not supported)
Real-time updates	Not supported	Supported via Microsoft Graph push notifications
Multiple calendars per site	One calendar per connection	Multiple calendars selectable during setup

The new Outlook SharePoint sync provides automatic two-way updates and supports multiple calendars from the same site. The classic method required manual refresh and supported only one calendar per connection. On-premises SharePoint sites are not compatible with the new sync; users on SharePoint Server must continue using classic Outlook or use a third-party sync tool.

Now you can add SharePoint calendars to new Outlook using the modern sync method. After setup, try adding a second calendar list from the same site to confirm multi-calendar support works. For advanced use, consider creating a SharePoint calendar list with custom columns to organize project milestones.