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 diagnose Office activation conflicts 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

• 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.
• There are various methods to resolve the Outlook sync issues, including manual and third-party solutions.
• 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'?
• Before finding solutions, we suggest that users check their internet connection.
• Another which is shown below, is a user opens a new message, or replies to one, and lets it sit for a while.

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

Before finding solutions, we suggest that users check their internet connection. Sometimes, Outlook sync issues can arise because of poor internet connection. If you are still facing this issue, kindly follow the solutions below to fix the sync issues in Outlook. There are various methods to resolve the Outlook sync issues, including manual and third-party solutions. Now, let us start with the manual processes to fix Outlook syncing errors.

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

To solve your Outlook issues, download the application from the Microsoft website and follow the directions. After the files get repaired, restart the Outlook program to ensure that the Outlook syncing issues are resolved or not. The simplest way to resolve authentication issues is to rerun the authentication process by clicking the Sign in with Microsoft on guide to Office 365 sign-in errors the Microsoft 365 settings page. You run the Microsoft consent process using an eligible M365 account after which you will be taken to the sync's setup wizard.

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

But setup is a little complicated and it can sometimes be difficult to identify the source of problems. We have resources to help you identify potential issues and fix them. The Support and Recovery Assistant, a tool provided by Microsoft, can identify and resolve common Outlook problems. It is capable of automatically identifying problems with account setups, sync, and online Outlook email repair utility other typical mistakes.





Typically this is because the selected groups have been deleted from Azure AD since the M365 sync was configured on your account. After viewing, see fixing problems with directory synchronization for Microsoft 365 to correct any identified issues. There can be several reasons for the Outlook synchronization error. Before we know the solutions, we will understand a few common causes of the Outlook sync problem. To get the sync working you will either need to delete users or have the user limit on your account increased. If you don't wish an inactive user to be made active by the M365 sync, you can add the user's email address to the sync forbid list.



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. To resolve these issues you should run the steps in this article and check whether the groups in your sync's filtering preference contain users in Azure AD. The Sync Summary email can give further information about this. The Users Loaded count will be 0 if all users fail to meet the system's requirements for user records. The Users Processed count will be 0 is there are no users in the synced dataset after filtering.



If the connection is poor, consider restarting your modem/router or moving to a more reliable network. We're in the process of migrating from On-Premise Exchange to O365. 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. Additionally, you might want to make a new profile and make it the default to see if it fixes the problem. 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'?