Windows calendar synchronization problems are usually caused by account errors, network or server failures. The solutions are as follows: 1. Check whether the account is logged in or needs to be reauthorized, and manually re-add the account; 2. Confirm that the synchronization function is enabled and try to synchronize manually; 3. Check network stability and time settings; 4. Clear cache or reset the calendar application. Sequentially checking usually solves the problem.

The most common reasons for the synchronization of Windows Calendar apps are account settings, instability in the network, or temporary server failure. To solve this problem, the key is to gradually check and start from the basics, rather than suspecting that the system is broken at the beginning.

Check whether the account is logged in normally

Many synchronization problems are actually because the account is not logged in or the authorization has expired. You can check this way:

• Open Settings → Accounts → Email and Accounts to see if your calendar account (such as Outlook, Google, etc.) is still on the list
• If you are in, click to see if there is a prompt "need to log in again" or "verification failed"
• Try to manually re-add the account, sometimes re-adding can refresh permissions and synchronize status

Especially for friends who use Google accounts, sometimes Google will update security policies, causing the old authorization to expire, and you need to re-allow Windows to access calendar data.

Make sure the synchronization is enabled

Sometimes you may think it is a synchronization problem, but in fact you accidentally turned off the synchronization:

• Enter the Calendar App → Click the three dots in the upper right corner → “Manage Accounts”
• Confirm that the "Sync Calendar" switch next to the corresponding account is on
• The synchronization frequency is automatic by default, but you can pull it to the bottom and click "Sync Now" to force refresh once.

If you are using an Outlook or Exchange account, you can also check whether the Calendar synchronization option is enabled in your account settings.

Network and time settings may also affect synchronization

Don't underestimate these two factors, they are often overlooked:

• Make sure your computer is connected to the network stable, try to access the web page to confirm that there is no problem
• Check whether the time and time zone settings are correct: Go to "Settings" → "Time and Language" → "Date and Time" to make sure that "Auto Set Time" and "Auto Set Time" are turned on

If the time is too different from the server, some services will refuse to synchronize the request, which will cause the calendar to not load.

Clear cache or reset calendar app

If nothing is wrong with the previous one, it may be that the local cache is corrupted. You can try clearing the cache:

1. Open Settings → Apps → Installed Apps
2. Find the Calendar app (may appear as "Microsoft Calendar")
3. Click it and select Advanced Options
4. Click the "Reset" button. This operation will not delete your account information, but will clear the local cache and reload it.

If it doesn't work, you can also consider uninstalling and reinstalling. Note that remember to back up important data before uninstalling (although most calendar data is in the cloud).

Basically these are the methods. In most cases, checking accounts in sequence, synchronous settings, network and cache can all solve most synchronization problems. The uncomplexing but easy to ignore is often in the setting details, such as a switch not turning on, or a prompt is not noticed after the authorization expires.

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