Calendar Problems

How to Fix an Outlook Subscribed Calendar That Does Not Refresh

Steven Parker Oct 14, 2026 870 views

Question details

An internet calendar subscription fails to refresh automatically in Outlook, requiring the user to constantly unsubscribe and resubscribe to see new updates.

How to Fix an Outlook Subscribed Calendar That Does Not Refresh

Product: Microsoft Outlook
Device & OS: not provided
Scenario: A user subscribes to a third-party internet calendar (such as a university learning management system) in Outlook to keep track of schedules.
Observed behavior: The calendar does not update with new events in Outlook, despite updating correctly in other applications like iCal and Google Calendar. Re-subscribing only pulls the latest data temporarily.

Before you start

Ensure you have a stable internet connection and copy the original iCal/subscription URL provided by your university or service, as you may need to re-add the subscription.

Solution 1Recommended

Add the Subscription Using Outlook on the Web

For Microsoft accounts, adding the internet calendar through Outlook on the web resolves syncing conflicts that occur in the desktop application.

Newer calendar settings and server protocols can sometimes interfere with subscriptions added directly via the Outlook desktop application. Managing the subscription from the web version ensures the server handles the syncing process reliably.

Remove the broken subscription

Open your Outlook desktop or web calendar, right-click the calendar that is not updating, and select 'Delete' or 'Remove' to unsubscribe.

Sign in to Outlook on the web

Open a web browser, navigate to Outlook.com or your organization's Microsoft 365 Outlook portal, and sign in to your email account.

Navigate to the Calendar module

Click on the Calendar icon on the left-side navigation pane to open your web calendar.

Add the calendar

Click 'Add calendar' in the left pane, select 'Subscribe from web', paste your calendar URL into the field, provide a name, and click 'Import'.

Add the Subscription Using Outlook on the Web

Syncing across devices: Once added via the web, the calendar will automatically sync down to your Outlook desktop client and mobile apps.

Solution 2

Rebuild the Internet Calendar PST File (For POP/IMAP Accounts)

If you are using Outlook desktop with a POP or IMAP account, renaming or deleting the local Internet Calendar data file can force Outlook to download a fresh, working copy.

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Frequently Asked Questions

Why does my subscribed calendar sync in Google Calendar but not Outlook?

Outlook handles internet calendar subscriptions differently than web-based platforms. Outlook caches the subscription data in a local PST file which can occasionally get stuck or corrupted, whereas platforms like Google Calendar and iCal pull updates directly from the server on a regular basis.

How often does Outlook refresh subscribed internet calendars?

By default, Outlook desktop checks for updates to subscribed internet calendars every time it performs a standard Send/Receive operation. Depending on your settings, this is typically every 30 minutes, but you can adjust this interval in the Send/Receive Groups settings.

Will deleting my Internet Calendar PST file delete my personal appointments?

No. The Internet Calendar PST file only stores data from your read-only calendar subscriptions. Deleting or renaming it will not affect your default personal calendar, emails, or contacts. It simply forces Outlook to re-download the events from the subscription link.

Outlook & Email Problems