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December 18, 2025
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But then again, after it restarts, everything works fine and then after like 2 minutes dies again. Before you dive into folder sync issues, read our complete Outlook and Office 365 Sync Guide for an overview of how synchronization works. By limiting synchronization to active folders, Outlook finishes updates faster and avoids timeouts. This issue usually happens when Outlook cannot properly connect or sync with your mail server. In this FixTechGuide tutorial, we’ll explore the causes and give you clear, step-by-step solutions to fix it fast. Re-adding the account forces Outlook to rebuild all folders and clear old stuck subscriptions.
Step 1: Check Internet and Server Connection
When Outlook gets stuck on "Synchronizing Folders", it’s usually a sync or file corruption issue — not a permanent failure. By following these methods step-by-step, you can restore full email synchronization without reinstalling Outlook. FixTechGuide continues to help users resolve Outlook and Office 365 errors quickly and safely. The thing is that the file explorer stops working completely after like 1 or 2 minutes the pc is on. Suddenly none of the files have thumbnails but a blank icon, most of the folders get stuck in "working on it" and the only thing that seems to fix it is restarting the pc.
Prevent Outlook Sync Problems in the Future
Upgrade to Microsoft Online Outlook Email Repair Utility Edge to take advantage of the latest features, security updates, and technical support. Outlook lets you manually control which folders sync with the server. If the test message sends successfully but folders don’t sync, move to the next step. Follow these steps in order—from quick fixes to deeper technical repairs. If Outlook syncs fine now, re-enable add-ins one by one to find the culprit.
Fix Outlook Stuck on Synchronizing Subscribed Folders (2025 Guide)
Faulty add-ins (especially antivirus or CRM extensions) can freeze Outlook during synchronization. My specs are 16 gb ram ddr4, 500gb ssd, rtx 3050 Ti, Amd Ryzen H so I don't believe the issue is caused by a slow-spec system. Outlook data file cannot be accessed This mode is ideal for slow connections or intermittent server responses.
A file freezes the file explorer every time I interact with it
You can download these tools from their official websites and follow the instructions provided by them to scan your external hard drive and attempt to unlock or recover the files. Also, you can try tools like "EaseUS Data Recovery Wizard" or "Stellar Data Recovery" are designed to handle such issues and might be able to restore access to your locked folders. I have tried deleting the file explorer caché, ending the task, windows recovery, cmd sfc/ scannow, disabling the quick access options, updating to W11. Nothing works or fixes the issue for a while until it goes back again to the same. My fans are also going crazy every time that happens, but the performance seems just fine in the task manager. For some reason I don't the go back to previous windows update option so that's modern authentication troubleshooting the only reason I didn't try that.
Re-adding the account forces Outlook to rebuild all folders and clear old stuck subscriptions.The thing is that the file explorer stops working completely after like 1 or 2 minutes the pc is on.By following these methods step-by-step, you can restore full email synchronization without reinstalling Outlook.Faulty add-ins (especially antivirus or CRM extensions) can freeze Outlook during synchronization.Follow these steps in order—from quick fixes to deeper technical repairs.
Advanced Fixes for Persistent IMAP Sync Problems
If you have a slow internet connection or large mailboxes, default timeouts may be too short.
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November 9, 2025
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I have no issues in Outlook 365 with being a global rebuild Outlook data file quickly admin and having modern authentication with multi-factor authentication. If you have an issue that's not listed in this article, go to the following Microsoft TechNet wiki page. The wiki page lists other known issues and workarounds. Since Microsoft recently demanded OAuth2 authentication, I've been trying everything I found here and at Microsoft, but every 'help' webpage to setup Hotmail and Thunderbird seem badly outdated. If the error you are encountering is not listed, please create a ticket on our Email and Calendar Help page for assistance.
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When desktop SSO fails, users may be unable to activate Microsoft 365 Apps for enterprise or users may be prompted for forms-based logon even though they are using domain joined-computers from inside the company network. The currently configured authentication methods can remain unchanged. For example, if Windows Integrated Authentication is configured as the primary authentication method, it can remain configured this way.
Outlook 365 Won't Prompt for Modern Authentication
Modern authentication (ADAL) with AD FixTechGuide Windows update Outlook fix FS requires the /adfs/services/trust/13/windowstransport endpoint to be enabled. But primarily I am guessing you are changing the server name. This does not enable any oauth list entry that may be available for that server. Then the entry will be in the list for you to select.
Please report suspicious activity using the "Report Abuse" option.UO email accounts set up in Mac Mail prior to the Modern Auth update will continue to work, provided the device is running macOS 10.14 or newer.Is there some kind of setting within O365 that’s forcing Outlook to use basic authentication ?It does look llike a one-time thing to switch it on.My concern is that MS will force modern authentication soon, and switch off basic authentication.
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If memory serves me right, modern auth with 2fa, and being a GA and using the account for outlook are known for issues. So, it looks like the version of Outlook that I have won’t play nice with Modern Authentication. I have confirmed that on two different PCs that are accessing the same mailbox with the same version of Outlook, which is the latest version from Microsoft included within my Office 365 package. If it continues to be problematic, you may need to either a.) Remove any related credentials from the users credential manager in Control Panel, it b.) Create a new outlook profile. We will never ask you to call or text a phone number or share personal information.
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Login to server outlook.office365.com with username [Duck ID]@uoregon.edu failed. Once your account has Modern Authentication enabled, you can no longer pull your UO email into Gmail and/or reply from send/receive error 0x800CCC0E fix Gmail on behalf of your UO account. This page contains information on what errors may come up when setting up your email with Modern Authentication (Modern Auth), and what steps are needed to resolve them.
Outlook 2021 and Modern Authentication not working
Create your account and connect with a world of communities. Once I added the AlwaysUseMSOAuthForAutodiscover value, it popped up the modern auth prompt and worked perfectly. I’ve just switched on Modern Authentication in Office 365, following on from Microsoft’s recommendation.
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