Calendar Problems

Fix Cannot Open a SharePoint Calendar in Outlook

Khadija Khan Oct 21, 2026 869 views

Question details

The user is unable to open or sync a SharePoint calendar in Microsoft Outlook, encountering a recurring connection error despite being connected to the internet.

How to Fix "Cannot Open a SharePoint Calendar in Outlook" Error

Product: Microsoft Outlook and SharePoint
Device & OS: Windows
Scenario: Attempting to view or synchronize a shared SharePoint calendar within the Outlook desktop application.
Observed behavior: The calendar fails to load intermittently, displaying a "Can't connect to server" error message.

Before you start

Ensure your internet connection is stable and verify that you can access the SharePoint calendar directly through your web browser before troubleshooting the Outlook application.

Solution 1Recommended

Remove and Re-add the SharePoint Calendar

Re-syncing the calendar establishes a fresh connection between SharePoint and Outlook, which often resolves intermittent sync errors.

Authentication glitches or temporary network drops can corrupt the local calendar cache in Outlook. By removing the calendar and adding it back directly from the SharePoint web interface, you force Outlook to download a fresh copy of the calendar data and re-authenticate your permissions.

Delete the calendar in Outlook

Open Microsoft Outlook, navigate to the Calendar view, right-click on the problematic SharePoint calendar in the left pane, and select 'Delete Calendar'.

Access SharePoint via browser

Open your web browser, navigate to your SharePoint site, and open the specific calendar you want to sync.

Reconnect to Outlook

Click on the 'Calendar' tab located on the SharePoint top ribbon, and click the 'Connect to Outlook' button.

Confirm the prompt

When your browser prompts you to allow the website to open a program, click 'Allow' or 'Yes' to launch Outlook and confirm the integration.

Remove and Re-add the SharePoint Calendar

Data Safety: Deleting the calendar from Outlook only removes the local sync view. It will not delete any events or data stored on the actual SharePoint server.

Solution 2

Clear Outdated Windows Credentials

Removing old or cached Microsoft 365 passwords prevents Outlook from attempting to authenticate with invalid credentials.

Solution 3

Test Outlook in Safe Mode

Running Outlook in Safe Mode helps determine if a third-party add-in is blocking the connection to the SharePoint server.

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Frequently Asked Questions

Why does my SharePoint calendar continuously say 'Can't connect to server'?

This usually occurs due to expired login credentials cached in Windows, a corrupted local calendar profile in Outlook, or temporary downtime with Microsoft 365 services. It can also happen if your account permissions for the SharePoint site have recently changed.

How do I check my permissions for a SharePoint calendar?

You need to log into the SharePoint site via a web browser. Navigate to the calendar, click on the 'Calendar' tab in the ribbon, select 'List Settings', and click on 'Permissions for this list'. You must have at least 'Read' access to sync the calendar to Outlook.

Will deleting and re-adding the calendar in Outlook delete my SharePoint data?

No. When you delete a SharePoint calendar from the Outlook interface, you are only removing the local shortcut and cached view on your computer. The actual events and data remain safely stored on the SharePoint server.

Can I sync a SharePoint calendar to Outlook on a Mac?

The direct 'Connect to Outlook' feature on SharePoint relies on Windows-specific protocols and ActiveX controls. Currently, Outlook for Mac does not natively support syncing classic SharePoint calendars in the same seamless way as the Windows version.

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