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I have a couple of Users and a Shared Mailbox that were migrated and both Users are experiencing issues with the Shared Mailbox updating on a regular basis.



solve Office 365 mailbox sync delays

Firstly, we will discuss a few manual methods to resolve this Outlook error and share the stepwise procedure of each method to successfully fix synchronization issues. Now, let us start with the manual processes to fix Outlook syncing errors. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. Sometimes an error appears in the Mail and Calendar apps when the apps try to sync new email or calendar events.

The client has a computer off the domain at home that his work email is tied to and he has never had any FixTechGuide email error solutions of these issues in Cache mode with that device. After performing these steps, Outlook’s all folders will be synced to the server. If this method doesn’t work for you, navigate to other solutions. Select the button below to launch a diagnostic in the Microsoft 365 admin center.

  • Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.
  • After these instructions, ensure the sync settings are correct and check everything is working well.
  • Before you begin, make sure that your device has the latest operating system and app updates.
  • I’ve unchecked download shared folders when setting up a new Outlook profile.


How to Fix Sync Issues in Outlook or OWA? – A Complete Guide



Moreover, it maintains the folder hierarchy and metaproperties of the data when processing Outlook data files. This tool also helps users fix Outlook syncing issues by repairing OST or PST files and syncing the data smoothly. Third-party firewalls or antivirus software might prevent you from syncing your email and calendar events.

Professional automation to resolve Microsoft Outlook syncing issues



If there's a feature you think is missing from the Mail and Calendar apps, or if a feature in isn't working properly, you can provide feedback directly to the Mail and Calendar team. Two-factor authentication helps protect your account by making it more difficult for someone else to sign in. It verifies your identity using your password and a contact method (also known as security info).

Method 5: Fixing Sync Issues in Outlook Web Access (OWA)



I’ve tried to set cache mode from 1 year all the way down to a few days. However, with one particular client no matter what changes are made these sync issue still occur. After these instructions, ensure the sync settings are correct and check everything is working well. To make sure there are no issues, click Test Account Settings to test the connection. Test other programs or websites to be sure Outlook is the only problem.

Delays in provisioning of user/mailbox or synchronizing changes in Exchange Online



solve Office 365 mailbox sync delays

Now, we will verify the server settings to fix the Outlook synchronization error. If you're using an Exchange account that requires advanced settings, you'll need to remove the account and add it again using advanced settings. To add the account using advanced settings, see Add an account using advanced setup.





If you paid for Office 365 and Exchange online then you should have support with them. recreate Outlook profile step by step Additionally, you might want to make a new profile and make it the default to see if it fixes the problem. If you would like to ask me another question in the future or follow up on your current question, you can add me as a favorite Expert. You'll have the option to do that on your "My Questions" page by clicking the heart icon labeled My Favorite.

Best Microsoft Office 365 Migration Tools in 2025





Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. If your password isn't the problem, you might have a certificate error. If so, you'll see a message that says, "There is a problem with the server's security certificate. The security certificate is not from a trusted certifying authority." Check with your email provider for instructions about how to create an app password for your email account. If you can sync your email when the firewall is turned off, you'll need to allow the Mail and Calendar apps through the firewall. Windows Defender Security Center is free security software that's included with Windows 10.

These are the only two I've seen have this issue and I was wondering if you've seen this and figured out a 'fix'? Tempted to create a Test Shared Mailbox, but thinking that wouldn't be an accurate test for inbound mail, etc. or just actually tested by the Users at all. Upgrade to Microsoft Edge to take advantage of FixTechGuide login issue guide the latest features, security updates, and technical support.



However, in some situations these processes can take up to 24 hours.

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