
Persevering with these troubleshooting steps will help identify and rectify many common Microsoft 365 synchronization problems. If the size of your .ost file is close to the limit, you could try increasing the limit on your client, restart Outlook and see if there is any difference. Manually forcing synchronizations in this manner can help surface any intermittent errors and confirm if fixes have resolved the issues. Now, manually sync your mailbox using the Update Folder button under the Send/Receive tab. If I check the sync log I see a lot of sync errors for Inbox, sent items and a few other folders. You can check the error message to find the cause behind the sync issue and fix it.
Why is Microsoft 365 not syncing?
Method 9: Resync the Mail Folders

Microsoft 365 provides essential productivity services that allow users to collaborate across devices and locations. This includes enabling the synchronization of email, calendar appointments, contacts, tasks, and notes seamlessly between different platforms. However, sometimes sync issues can occur, which lead to changes not syncing properly or data not staying up to date between connected services and apps. In this guide, we will provide you with comprehensive troubleshooting instructions to identify and resolve the most common Microsoft 365 synchronization problems that may arise.
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You can experience sync issues in Outlook due to poor or no network connectivity. So, first check if your internet connection is stable and working properly. If the connection is slow or inconsistent, you can restart the router or contact your internet provider/IT admin for help. These syncing problems usually happen because of issues like a damaged Outlook profile, poor internet connection, or a corrupted OST file. If restarting Outlook or fixing the profile doesn’t work, converting the OST file is often the next step. EdbMails OST to PST Converter can help in these cases by recovering data from the inaccessible OST files and restoring them without data loss.
This tool is designed to extract mailbox items from orphaned or inaccessible OST files. A large OST file can lead to performance issues and result in Outlook not syncing with the Exchange Server, disrupting your workflow. To resolve this, you can reduce the Outlook data file (OST) size. This can help optimize Outlook’s performance and fix the synchronization issues. We’ve had sync issues with employees from time to time however, re doing the mail profile or wiping the Windows profile usually fixes it. In some cases setting up a new computer replacement was the only option to fix these odd Outlook Sync issues.
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However, with one particular client no matter what changes are made these sync issue still occur. Here is the strange part I tried to remove the computer from the domain and have Outlook run from a local account for a few days. I’ve been in contact with Microsoft they had me migrate his account\data to another server this did not fix it.
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Want to chat about how Microsoft 365 can benefit your business? During the scanning process, security applications, like antivirus software or Windows Firewall might lock the Outlook data file, leading to the sync issues. To check if the security application is causing the issue, you can temporarily disable the antivirus program or Firewall and then update the folders. If the issue is resolved, it indicates that your antivirus software or Firewall is interfering with Outlook. To resolve this, you can add Outlook and its related processes as exception in your security software or consider switching to a security application that is compatible with Outlook.
- However, with one particular client no matter what changes are made these sync issue still occur.
- We have resources to help you identify potential issues and fix them.
- I’m signed in on my windows account and my one drive seems to be working but when I open word, excel, onenote, etc.
- The client has a computer off the domain at home that his work email is tied to and he has never had any of these issues in Cache mode with that device.
- Tried searching online for a solution but didn’t find a solution.
- Manually forcing synchronizations in this manner can help surface any intermittent errors and confirm if fixes have resolved the issues.
- You can check the error message to find the cause behind the sync issue and fix it.
The client has a computer off the domain at home that his work email is tied to and he has never had any of these issues in Cache mode with that device. I’ve unchecked download shared folders when setting up a new Outlook profile. I’m running into an issue with syncing my MS account across my MS 365 Office apps. I’m signed in on my windows account and my one drive seems to be working but when I open word, excel, onenote, etc.

Once the client started using Outlook again after some time has passed the issue had come back. I ran the PSTscan tool to check for anomalies on the OST file (which it found and repaired but the issue still occurs). Below Microsoft 365 support are the steps I’ve taken to try to resolve this issue.
by biancabevington