The sync will fail if the total number of all users (active or inactive) on your account exceeds the user limit placed upon it if present. The Summary sheet on fix Outlook after Windows update issues the spreadsheet attachment of your sync summary includes an Updated User Count and User Limit. These figures will give you an impression of how far over the limit the account is.

Methods to fix Microsoft Outlook syncing error

• To solve your Outlook issues, download the application from the Microsoft website and follow the directions.
• If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook.
• You can close the wizard at this point as you do not need to complete it for re-authentication to take effect.
• You can stop any accounts from being brought over by adding them to the sync deny list.
• The causes of sync issues and local failures in Outlook are explained in this guide, along with practical troubleshooting and resolution techniques.
• The sync will fail if the groups you selected to load users from no longer exist in Azure AD.
• Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and workflow.
• Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not.
• 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.

Similarly you should review 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. Another which is shown below, is a user opens a new message, or replies to one, and lets it sit for a while. When they go back to the message and press send they get an error that the message has been deleted. Ive repaired the OST and changed cache mode to only cache 1 year. The M365 sync establishes a synced dataset based on your M365 data and the filtering configuration of your sync.

Common Causes of Sync Issues in Outlook

Find out what to do if you are having issues with syncing users or groups from Microsoft 365. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. The error message in the Summary sheet of the Sync Summary spreadsheet attachment can also highlight the reason for this. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. To make sure there are no issues, click Test Account Settings to test the connection.

[Answered] Secured OST to PST Converter for OST to PST Conversion

So, follow the below steps to reset Microsoft Outlook settings. The sync does not delete users but rather sets them to inactive. The idea is to provide a recycle bin of users who you can delete when you no longer need them. You can view your inactive users on troubleshoot outlook Synchronizing folders error the Users page and delete them as you see fit.

What should I do if my sync failed due to authentication issues?

If users are facing syncing issues in Outlook due to corrupt Outlook data files, they must choose a professional tool, like Shoviv OST to PST Converter Tool. This software allows users to process numerous OST files at once without any size limitations. 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. Here, we will discuss the five manual methods to troubleshoot Outlook synchronizing folders error fix sync issues in Outlook or OWA.





You can do this in the Microsoft 365 Sync Wizard on the configuration page of your platform settings. 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. Knowing the reasons behind the Outlook sync issues will help us to fix this problem and prevent issues in communication and workflow. 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.

What privileges do I need to authorise the M365 sync?

It is possible for a corrupted Outlook profile to impede synchronization. After these instructions, ensure the sync settings are correct and check everything is working well. This means that the authentication setup for your sync is no longer valid.



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 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.