Outlook Calendar Not Syncing? Here's The Fix!

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When multiple users make changes to the calendar simultaneously, conflicts can occur.

Outlook calendar sync fix

Remember, the repair process may take some time, especially for accounts with large amounts of data. Check with your email provider for instructions about how to create an app password for your email account. We're sorry you're having problems with the Mail and Calendar apps for Windows 10.

Check Network and Internet Connectivity



Just add your same account via the automatic account wizard which will setup as an IMAP account. Then once setup and working, drag / move all your existing POP messages and any custom message folders to your new IMAP account. Then once you are certain all your messages are all there, remove your POP account. Now that you have a clearer understanding of the potential causes, let’s explore the step-by-step solutions to address the Outlook Calendar not syncing issue. After confirming synchronization is not working, follow thesolutions discussed below to troubleshoot the issue.



How to Use Scheduling Assistant in Outlook for Easy Meeting Planning



Outlook calendar sync fix

These sync hiccups can stem from various sources, including network connectivity problems, outdated software, or conflicts between different calendar services. Below are the solutions you can follow to troubleshoot or fix the shared calendar syncing problem with Outlook. Remember, patience is key when dealing with shared calendar sync issues. Some changes may take time to propagate across all users and devices. If you’re receiving this email, you’re currently using a mail or calendar app with a less secure authentication method to sign in to your Outlook.com email account.



You receive an error message when syncing email



  • Remember, forcing a sync or clearing cache can take some time, especially for large mailboxes.
  • Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10.
  • To add the account using advanced settings, see Add an account using advanced setup.
  • Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
  • This section will guide you through a series of troubleshooting steps to get your calendar back on track, whether you’re using Outlook on your desktop or mobile device.
  • For teams looking to enhance their calendar management further, the Virto Calendar App for Microsoft 365 & Microsoft Teams offers a powerful alternative.
  • Sometimes the token will not contain these characters and be accepted.


In this section, we’ll explore how the Virto Calendar App for Microsoft 365 and Microsoft Teams can take your calendar management to the next level. We’ll delve into the benefits of using this powerful app and highlight its features specifically designed to troubleshoot sync issues. Remember, identifying the root cause is the first step to resolving your sync issues. In the following sections, we’ll dive into specific solutions to get your Outlook calendar syncing smoothly again. In fact, calendar synchronization problems are among the most frequently reported issues by Outlook users.

Common Reasons for Shared Calendar not Syncing with Outlook Issue



The Mail and Calendar apps for Windows 10 don't support two-factor authentication. If two-factor authentication is turned on for your account, you'll need to create an app password for that account. An app password is used instead of your normal account password for apps that don't support two-factor authentication. If you have a Google, Yahoo! Mail, iCloud, IMAP, or POP3 account, check the settings in the advanced mailbox settings to make sure they're configured to your email provider's specification. If you're using an Outlook.com, Microsoft 365, or Exchange account, you won't have advanced mailbox settings unless the account was set up using advanced setup. If you have a outdoor signs for business POP Outlook account "don’t initially remove your account".

Restart Your iPhone (for iPhone users)



Why do I keep getting a sync error on my calendar?



Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events. Once you have a stable network connection, you can proceed with the troubleshooting steps for Outlook Calendar syncing. However, they're not doing anything in particular to cause the issue - just using outlook with no add ins outside of teams, so this seems to be a new bug in the past week or two.
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