How to Fix Outlook Calendar Not Syncing on Windows (7 Easy Fixes)

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Quick Tips

• Restarting Outlook and Windows fixes most sync issues instantly
• Outlook sync problems often occur due to outdated apps or corrupted cache
• Microsoft Exchange accounts are more sensitive to sync interruptions

Outlook Calendar not syncing on Windows can be frustrating—especially when meetings, reminders, or shared calendars don’t update correctly. Whether Outlook fails to sync with Microsoft 365, Exchange, or Google Calendar, this guide will help you fix the issue step by step.

Below, we cover proven fixes that work on Windows 10 and Windows 11, without deleting your data.

Part 1: Check Internet Connection and Outlook Server Status

Before changing any settings, ensure your internet connection is stable.

Step 1: Check Microsoft Outlook Service Status

1. Open your browser and search Microsoft 365 service status
2. Confirm Outlook services are running normally

If Microsoft servers are down, syncing will resume automatically once services are restored.

Part 2: Restart Outlook and Windows

Temporary background glitches can stop calendar syncing.

Step 2: Restart Outlook

1. Close Outlook completely
2. Open Task Manager
3. End all Outlook-related processes
4. Reopen Outlook and check calendar sync

Restart your computer if the issue persists.

Part 3: Update Outlook to the Latest Version

Outdated Outlook versions often cause syncing issues.

Step 3: Update Outlook

1. Open Outlook
2. Click File → Office Account
3. Select Update Options → Update Now

Wait for updates to install and restart Outlook.

Part 4: Turn Off Offline Mode

Offline mode prevents Outlook from syncing calendar data.

Step 4: Disable Work Offline

1. Open Outlook
2. Go to the Send/Receive tab
3. Ensure Work Offline is NOT enabled

Once disabled, Outlook should immediately begin syncing.

Part 5: Clear Outlook Cache Files

Corrupted cache files can block calendar updates.

Step 5: Clear Outlook Cache

1. Close Outlook
2. Press Windows + R
3. Paste:

%localappdata%\Microsoft\Outlook

4. Delete all files inside the folder
5. Reopen Outlook

Outlook will rebuild fresh cache files automatically.

Part 6: Repair Outlook Data File

Damaged data files may cause incomplete calendar sync.

Step 6: Repair Outlook

1. Go to Control Panel → Programs
2. Select Microsoft Office
3. Click Change
4. Choose Quick Repair
5. Restart your PC

If the issue continues, use Online Repair.

Part 7: Remove and Re-Add Outlook Account

This fix works when nothing else helps.

Step 7: Re-add Account

1. Open Control Panel → Mail
2. Select Email Accounts
3. Remove your Outlook account
4. Add the account again
5. Restart Outlook

Your calendar should now sync properly.

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Let us know in the comments if these fixes resolved your Outlook Calendar sync issue.

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