You can close the wizard at this point as you do not need to complete it for re-authentication to take effect. You should run a test sync after re-authenticating the sync to ensure it is working. Now, we will verify the server settings to fix the Outlook synchronization error. The sync will fail if the groups you selected to load users from no longer exist in Azure AD.

Common Causes of Sync Issues in Outlook

Typically this is because the selected groups have been deleted from Azure AD since the M365 sync was configured on your account. Outlook’s ability to connect to the mail server may be blocked by firewalls or antivirus software. After you’re satisfied, turn off your firewall or antivirus program for a while. If it does, you might need to include Outlook exceptions in the settings of your security program. After viewing, see fixing problems with directory synchronization for Microsoft 365 to correct any identified issues. After performing these steps, Outlook’s all folders will be synced to the server.

Fixing problems with directory synchronization for Microsoft 365

Sync failure alerts do not always include a full summary or attachment, you can run a test sync to obtain this data. The other solution to fix Outlook sync issues is recreating Microsoft Outlook profile. Incorrect Outlook settings can also Outlook Stuck on Synchronizing Folders be one of the reasons behind Outlook synchronization errors. So, follow the below steps to reset Microsoft Outlook settings. The M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync.

• It is capable of automatically identifying problems with account setups, sync, and other typical mistakes.
• Sync failure alerts do not always include a full summary or attachment, you can run a test sync to obtain this data.
• These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file.
• Outlook’s ability to connect to the mail server may be blocked by firewalls or antivirus software.
• Another which is shown below, is a user opens a new message, or replies to one, and lets it sit for a while.
• The M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync.
• Both of our authentication methods can fail if the Enterprise Applications entry for the sync in Azure AD is deleted or if it has had its permissions modified.

Use the Microsoft Support and Recovery Assistant

Outlook sync issues can be because of corrupted Outlook OST or PST files. Therefore, now we will know the steps to repair the Outlook data file. The most common reason for missing users is that you've run a Test Sync, instead of a Manual Sync. If that doesn't resolve your missing users issue, please follow our guide to troubleshooting missing users below. With directory synchronization, you can continue to manage users and groups on-premises and synchronize additions, deletions, and changes to the cloud.

How to Fix Outlook Sync Issues in Windows?

The sync will fail if it can't find any users that comply with your filtering preferences or the system's requirements for user records. The system requires that users have a first name, last name and a valid email address that conforms with your domain lock if enabled. The sync does not delete users but rather sets them to inactive. The idea is to provide a repair pst File without data loss recycle bin of users who you can delete when you no longer need them.

Mailing Address

You can view your inactive users on the Users page and delete them as you see fit. Similarly you should review Office 365 Sync Errors Fix the Users Deactivated sheet on the sync summary spreadsheet attachment as you can also delete these users to bring your total down. I have multiple users experiencing sync errors with Outlook and office365.

What should I do if my sync fails because it can't find any users?

The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this. This means that the authentication setup for your sync is no longer valid. This can happen for the a number reasons particularly if your sync authenticates using Delegated Permissions.

Fix Sync Issues and Local Failures in Microsoft Outlook: Problem Resolved!

This tool also helps users fix Outlook syncing issues by repairing OST or PST files and syncing the data smoothly. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions. 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.