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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.

Method 9: Resync the Mail Folders

However, his OST file is not anywhere near that size it’s about 5GB. If the problems do not occur in safe mode, its most likely an add-in causing grief. I was wondering if anyone had some insight into an issue I am having with a client.

Method 14: Repair/Reinstall Microsoft Office

I’ve tried the Microsoft office uninstall tool provided by Microsoft (which deletes more items then just control panel uninstall). Now, restart Outlook and check if Outlook synchronization is working. I’m at wits end and Microsoft stopped helping me because they feel the problem is on our end. However, I cannot find any reason why his account would do this only on our domain nothing is blocking our connection to Office 365. However once I joined this computer back to the domain and let it sit for a few days it was also working fine.

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.

Method 6: Reduce Outlook Data File (OST) Size

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.

Method 4: Update Outlook Application

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.

• We have a Hybrid environment with a lot of our accounts being created on premise in Active Directory and syncing to O365 and exchange.
• Once the client started using Outlook again after some time has passed the issue had come back.
• However, I cannot find any reason why his account would do this only on our domain nothing is blocking our connection to Office 365.
• Once you have explored the basics like internet connectivity and updated software, examining any error reports becomes critical to zeroing in on the problem.
• If restarting Outlook or fixing the profile doesn’t work, converting the OST file is often the next step.
• I’ve tried to set cache mode from 1 year all the way down to a few days.
• EdbMails OST to PST Converter can help in these cases by recovering data from the inaccessible OST files and restoring them without data loss.
• I still have it turned on on my laptop and it has not shown any issues yet.
• I get a “We’re having trouble syncing. Click “Sign in again” to fix this issue” error at the top of window.

Method 11: Clear Outlook Cache

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 Outlook troubleshooting are the steps I’ve taken to try to resolve this issue.