New Outlook vs Classic Outlook SharePoint Calendar Sync: What to Use Instead

You need to view a SharePoint calendar in Outlook but the sync methods you used before no longer work. Microsoft changed how SharePoint calendars connect to Outlook, and the New Outlook does not support the old “Connect to Outlook” button at all. This article explains the difference between the two sync methods and shows you the alternatives that work today.

The classic Outlook could subscribe to a SharePoint calendar using a SharePoint list connection. The New Outlook removes this feature entirely. Instead, you must use Power Automate flows, SharePoint alerts, or a calendar overlay in SharePoint itself. This guide covers each option so you can choose the right one for your setup.

You will learn why the old method stopped working, what each Outlook version can and cannot do, and step-by-step instructions for the replacement methods. No workaround or registry hack can restore the old sync in New Outlook.

Why SharePoint Calendar Sync Changed in Outlook

SharePoint stores calendar events in a standard list. When you clicked “Connect to Outlook” in classic Outlook, Outlook subscribed to the SharePoint list using a web-based iCal feed. This created a read-only calendar folder that updated periodically. The underlying technology is the SharePoint list sync protocol.

Microsoft redesigned Outlook to use a new sync engine that does not support SharePoint list subscriptions. The New Outlook is built on the same platform as Outlook for the web. It uses Microsoft Graph to connect to Exchange Online, but it does not include a connector for SharePoint list feeds. This change is permanent. Microsoft confirmed that the “Connect to Outlook” feature will not return to New Outlook.

Classic Outlook still supports the feature as of 2025. However, Microsoft is gradually moving all users to New Outlook. If your organization has not yet switched, you can still use classic Outlook for SharePoint calendar sync. But you should plan for the eventual migration.

New Outlook vs Classic Outlook: What Each Can Do

The table below summarizes the key differences. Use this to decide which version to use and which replacement method fits your workflow.

Feature	Classic Outlook	New Outlook
Connect to SharePoint calendar	Yes, via ribbon button	No, button is disabled
Read-only calendar subscription	Yes, updates every 30 minutes	Not available
Edit events in Outlook	No, must edit in SharePoint	N/A
Receive email alerts from SharePoint	Yes, via SharePoint alerts	Yes, via SharePoint alerts
Power Automate integration	Manual flow only	Manual flow only
Calendar overlay in SharePoint	Yes, works in browser	Yes, works in browser

Step-by-Step: Use Classic Outlook While You Still Can

If your organization still allows classic Outlook, follow these steps to sync a SharePoint calendar. This method works in Outlook 2016, 2019, 2021, and classic Outlook for Microsoft 365.

1. Open the SharePoint calendar in a browser
   Navigate to your SharePoint site. Go to the site contents or the calendar app. Click the calendar name to open it.
2. Click the Calendar tab in the ribbon
   On the top ribbon, click the Calendar tab. Look for the Connect & Export group.
3. Click Connect to Outlook
   Click the Connect to Outlook button. A dialog box appears asking for confirmation. Click Allow. Outlook opens and creates a new calendar folder under Other Calendars.
4. Verify the connection
   In Outlook, expand Other Calendars. You see the SharePoint calendar name. Events appear as read-only items. Do not edit them here — changes will not sync back to SharePoint.
5. Set the refresh interval (optional)
   Classic Outlook refreshes the subscription automatically. To force an immediate refresh, right-click the calendar folder and select Update Folder. You cannot change the refresh interval manually.

Step-by-Step: Replace the Sync in New Outlook

New Outlook users cannot use the old sync. Use one of these three methods instead. Each method has a different purpose. Choose the one that matches your needs.

Method 1: Use SharePoint Alerts for Email Notifications

SharePoint alerts send email when calendar events are added, changed, or deleted. This does not add events to your Outlook calendar. It only sends notifications to your inbox.

1. Open the SharePoint calendar
   Go to the SharePoint calendar in your browser.
2. Click Alert Me
   On the ribbon, click Alert Me. If you do not see it, click the ellipsis (…) and select Alert Me.
3. Set alert criteria
   Choose when to send alerts: when items change, when items are deleted, or when items are added. Enter your email address. Click OK.
4. Manage alerts in Outlook
   Alerts arrive in your inbox. You can filter them using an Outlook rule. Create a rule that moves alert emails to a specific folder.

Method 2: Use Power Automate to Copy Events

Power Automate can copy SharePoint calendar events to an Outlook calendar. This creates duplicate events that you can edit. Changes do not sync back to SharePoint.

1. Go to Power Automate
   Open make.powerautomate.com. Sign in with your work or school account.
2. Create an automated cloud flow
   Click Create and select Automated cloud flow. Search for “SharePoint” and choose the trigger “When an item is created or modified.” Enter your SharePoint site address and calendar list name.
3. Add an Outlook action
   Click New step. Search for “Outlook” and choose “Create event” (V2) or “Send an email” depending on your goal. Map the SharePoint columns to the Outlook event fields: Title, Start Time, End Time, Description.
4. Save and test
   Click Save. Add a test event to the SharePoint calendar. Check your Outlook calendar to confirm the event appears. Note that this is a one-way copy. Deleting the event in SharePoint does not delete it in Outlook.

Method 3: Use Calendar Overlay in SharePoint

Calendar overlay lets you view multiple SharePoint calendars in one view inside SharePoint. This does not involve Outlook at all. It is useful if you only need to see combined calendars in the browser.

1. Open the primary calendar
   Go to the SharePoint calendar that you want to use as the main view.
2. Click Calendar > Overlay
   On the ribbon, click Calendar, then click Overlay. Click New Overlay.
3. Select the secondary calendar
   Choose a calendar from the same site or another site. Set the overlay color. Click OK. The secondary calendar events appear in the primary view.

What to Do If the Old Sync Still Does Not Work

“Connect to Outlook” button is grayed out

This happens when the SharePoint site is set to read-only or the calendar list does not support subscriptions. Check with your SharePoint administrator. In classic Outlook, make sure you are using the desktop version, not the New Outlook toggle.

Events appear but do not update

Classic Outlook refreshes the iCal feed every 30 minutes. If you need immediate updates, right-click the calendar folder and select Update Folder. If events still do not update, remove the connection and reconnect using the steps above.

Power Automate flow fails to create events

Check the flow run history. Common causes include missing permissions to the SharePoint list or the Outlook calendar. Ensure the flow owner has at least Edit permissions on both. Also verify that the SharePoint column names match the dynamic content fields in Power Automate.

New Outlook vs Classic Outlook: Key Differences for SharePoint Calendar Sync

Item	Classic Outlook	New Outlook
Supported sync method	iCal subscription via SharePoint list	None built-in
Edit events in Outlook	No (read-only)	N/A
Refresh interval	30 minutes (automatic)	N/A
Best replacement	None needed	Power Automate or SharePoint alerts
Works offline	Yes, cached events	No (replacement methods require internet)
Requires admin setup	No	Yes, for Power Automate flows

If you still use classic Outlook, keep the SharePoint calendar sync active as long as possible. If you are on New Outlook, set up a Power Automate flow to copy events to your Outlook calendar. This gives you a viewable calendar without the old sync. For notifications only, use SharePoint alerts. Calendar overlay in SharePoint is a good option if you work mostly in the browser. Test each method with a small set of events before rolling it out to your team.