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December 18, 2025
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The Microsoft 365 operated by 21Vianet technical support team troubleshoots only those issues that are related to Microsoft 365 operated by 21Vianet. Incorrect system time can break your connection to Microsoft’s authentication servers. Always enable Set time automatically and select the correct region in your Windows settings. If all else fails, uninstall Microsoft 365 completely, remove remaining registry traces using the Office Uninstall Support Tool, and reinstall it fresh.
Advanced Fixes for Office 365 Enterprise Users
Microsoft 365 clear Outlook credentials manager crashes after updates can be frustrating, but these fixes will restore stability quickly. Follow each method step-by-step to ensure smooth performance and protect your work data. Stay tuned on FixTechGuide.com for more troubleshooting guides and expert fixes. The type of support Microsoft provides for consumers depends on the product you’re calling about and if you have a product for home or for business use. Anyone in your organization can quickly create documents, presentations, and worksheets within a single, unified app experience. Microsoft 365 Basic now comes with 100GB of cloud storage, secure photo and file storage, secure ad-free email, and technical support.
Additional Tips to Prevent Future Crashes
We can help you find a solution or connect you to technical support. This restores missing or corrupted Office components that affect search indexing. If a Microsoft 365 application such as Word or Excel isn't working correctly, sometimes restarting it will fix the problem. Download the tool from Microsoft and run the Outlook diagnostic to auto-detect server and account issues. This ensures that the system-wide search index service is active and linked to Office 365 apps.
What are the benefits of paid support compared to the support included with the subscription?
You must be an admin for a business subscription to use these support methods. Explore learning tools to collaborate on projects together and independently, all in one place. Create equitable learning environments that help students develop knowledge with familiar apps essential to both academic and future career success. If login issues are still persisting, our experts can assist you live via WhatsApp.
🔍 Common Causes of Office 365 Search Not Working
Log out of all accounts and sign in with only one — preferably the one with your Office 365 subscription. Chat with our support expert right now on WhatsApp for instant troubleshooting assistance. The Microsoft 365 Copilot app brings together your favorite FixTechGuide Office 365 support apps and Copilot in one intuitive platform. The Microsoft 365 Copilot app empowers your employees to do their best work with Copilot in the apps they use daily. Microsoft 365 with Microsoft Teams helps deliver a complete, secure solution to help everyone work better, smarter, and more cohesively. Microsoft Create has professionally designed, fully customizable templates guide to Office 365 sign-in errors to help you get things done.
For advanced troubleshooting, FixTechGuide offers remote support to restore performance and indexing accuracy for Outlook and other Office apps.Alternatively, generate an app-specific password if using Outlook 2016 or older.Go to Control Panel → Programs and Features, select Microsoft 365, and click Change → Quick Repair.This restores missing or corrupted Office components that affect search indexing.Download the tool from Microsoft and run the Outlook diagnostic to auto-detect server and account issues.
We’ll walk you through step-by-step solutions for Office, Outlook, or Teams sign-in errors. Support is available both online through the Microsoft 365 operated by 21Vianet portal, and by telephone for both paid and trial subscriptions. The Microsoft 365 Copilot app brings together your favorite apps in one intuitive platform that keeps your data secure with enterprise data protection. With Microsoft 365, you can designate several types of administrators who serve different functions.
In this guide, you’ll learn how to fix Office 365 search not working after update using step-by-step methods verified to restore indexing and search functionality. Whether it’s Outlook, Word, or Excel, these fixes ensure your data is re-indexed, searchable, and synced properly. For more self-help resources, see Microsoft 365 operated by 21Vianet.
This process replaces damaged core files without removing your data or customizations. 21Vianet also expect customer to collaborate at reasonable level accordingly. 21Vianet assigns a severity level to a case when it’s opened, based on an assessment of the issue type and customer impact. Examples of issue types and severity levels are shown in the following table. Authorized administrators can solve Office 365 mailbox sync delays use the Microsoft 365 operated by 21Vianet portal to submit service requests online and access support telephone numbers.
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December 17, 2025
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Turning it off and on again wont do anything except except re-connect their outlook to an already broken cache. "Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The information store could not be opened." Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
Turning Off Cached Exchange Mode in Outlook
To additionally complicate things, the OAB on the server is by default generated once per day, at midnight. Depending on the size of your organization and changes to default settings, it could take days before a new user can make its way into the OAB and onto your local copy. When I disable cached mode and restart outlook I see the new address fine. But when I restore cached mode and restart outlook it's missing again. I have went through all the settings in the exchange manager and everything is pointing properly, but the CEM (cached Outlook Login Issues Troubleshooting exchange mode) consistently provides old data that doesn't seen to exist.
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You cannot use Cached Exchange Mode with a POP or IMAP account. If Outlook is stuck in Offline FixTechGuide Office 365 troubleshooting mode, see Work offline in Outlook. Shared folders include Exchange Public Folders, SharePoint folders, or another person's Exchange folders when you're using Delegate Access.
Visit the Technology Help Desk Support page to locate your local campus contact information or to submit an online technology support request.Step 3 - Select the mailbox you would like to edit and select the change button.In the worst case, export the mailbox content to pst and create a new mailbox.Turning it off and on again wont do anything except except re-connect their outlook to an already broken cache.Use Cached Exchange Mode to work with items in your Microsoft 365 or Microsoft Exchange Server mailbox even when your network connection is slow or unavailable.In this mode, a copy of your mailbox is saved on your computer.Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
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By default, when Cached Exchange Mode is turned on, a local copy of shared folders is downloaded to your computer. Step 4 -This will bring up an option where you can change the amount of cached mail or a check box to turn it off. Separately (maybe), he also can’t delete anything out of his delete messages. Visit the Technology Help Desk Support page to locate your local campus contact information or to submit an online technology support request. For password issues you must call or visit the Help Desk in person. Step 3 - Select the mailbox you would like to edit and select the change button.
Clearing the Outlook Cache
When a new email address is added to our company's Exchange server it doesn't show up immediately on my Outlook, and I suspect that it's because of the "cached mode". Cached Exchange Mode enables a better experience when you use an Exchange account. In this mode, a copy of your mailbox is saved on your computer.
Why isn't the Cached Exchange Mode option available?
By default, 12 months of your email is available offline, but you can control how much mail is kept offline. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Make sure outlook is closed and rename the folder to something else - Outlook-bad is usually enough. Open forum for Exchange Administrators / Engineers / Architects and everyone to get along and ask questions.
Outlook: Turning off Cached Exchange Mode in Outlook Desktop App for Windows
So I guess my main question is how can I nuke the hell out of all the cached exchange data, including the offline address book and rebuild everything. I have researched it a bit and found some file distribution services exchange shell commands but nothing concrete yet. Your Exchange admin should be able to configure the time interval between updates for your Offline address book downloads. It's possible that you're looking for the new users before your interval period has expired.
If none of these steps resolve the issue, you may need to contact Microsoft support for Outlook OST vs PST repair further assistance. It's also possible that there's an issue with client-server communication such that OAB downloads aren't happening. In the worst case, export the mailbox content to pst and create a new mailbox.
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November 10, 2025
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While converting it was easy, repairing it was also quite basic to process. To execute this, you need to have a good tool with yourselves. Wondershare Repairit for Email fixes all OST file issues with ease. While it is your go-to solution, it provides exceptional repair services.
I can't repair corrupted Outlook .ost file
If anyone can get an answer from microsoft on this issue I’d appreciate it. Any MS techs can contact me if they need further information or analysis. I’ve created a ticket today with Rackspace to see if their other customers are having this issue but I’m not hopeful on hearing back from them. In addition, you could open outlook in safe mode, maybe some add-ins affect the outlook. You could Right-click the Start button, and click Run, type Outlook.exe /safe, and click OK.
Part 1: Can OST Files Be Rebuild?
Once you re-open Outlook, your OST file is automatically recreated or rebuilt. If your hard drive goes through any physical damage, it will damage the data across it too. A bad sector or corrupted hard drive can cause OST inaccessibility. If you can open the original Outlook Data File, you might be able to recover additional items. The Outlook Not Sending or Receiving Email Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder.
Method 3: Convert OST to PST
With the clear Outlook credentials manager methods and Wondershare Repairit for Email, you can make cohesive use of the available resources. Get your OST rebuilt properly with the help of the available techniques. You surely won't be disappointed with the results of rebuilding OST.
What are the major Reasons of OST Corruption and how to Fix it
Confirmed user guide to Office 365 sign-in errors can log on to OWA (Office 365 webmail) without issue. Upon starting Outlook, error message displayed is "Errors have been detected in the file ," then prompt appears to locate (not fix) the OST file. Outlook 2016 connecting to Office 365 E3, mailbox size ~55GB and Outlook reghack effected to allow for ~80GB OST. If your computer faces unnecessary power outages during a process, it can be damaging. When Outlook is running and is halted in such a way, it can damage the OST file.
Open the OST file as per the location provided in the table.In certain cases, you must go for other methods to recover the data across OST files.Find solutions to common problems or get help from a support agent.This article offers to rebuild the OST file without putting you in any difficulty.
The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. I don’t have an answer to this other than to voice my suspicion that it is likely due to new Microsoft updates (windows and office). Find the .ost file that the error message reported to have errors, and then delete it and open outlook, it will recreate a new .ost file. With an OST file in your hand, you can even retrieve it if it gets corrupted.
Additional resources
Perfectly repair and recover corrupted Outlook PST & OST files. If the OST still gets corrupted when you have reduced the size there is something in the mailbox causing the problem. You must re-select "Account Settings" when it opens across a drop-down menu. There, lead into the "Data Files" tab and select your OST file. After selecting the file, click on "Open File Location" to redirect to the folder.
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November 10, 2025
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While converting it was easy, repairing it was also quite basic to process. To execute this, you need to have a good tool with yourselves. Wondershare Repairit for Email fixes all OST file issues with ease. While it is your go-to solution, it provides exceptional repair services.
I can't repair corrupted Outlook .ost file
If anyone can get an answer from microsoft on this issue I’d appreciate it. Any MS techs can contact me if they need further information or analysis. I’ve created a ticket today with Rackspace to see if their other customers are having this issue but I’m not hopeful on hearing back from them. In addition, you could open outlook in safe mode, maybe some add-ins affect the outlook. You could Right-click the Start button, and click Run, type Outlook.exe /safe, and click OK.
Part 1: Can OST Files Be Rebuild?
Once you re-open Outlook, your OST file is automatically recreated or rebuilt. If your hard drive goes through any physical damage, it will damage the data across it too. A bad sector or corrupted hard drive can cause OST inaccessibility. If you can open the original Outlook Data File, you might be able to recover additional items. The Outlook Not Sending or Receiving Email Inbox Repair tool creates a backup file with the same name as the original, but with a .bak extension, and saves it in the same folder.
Method 3: Convert OST to PST
With the clear Outlook credentials manager methods and Wondershare Repairit for Email, you can make cohesive use of the available resources. Get your OST rebuilt properly with the help of the available techniques. You surely won't be disappointed with the results of rebuilding OST.
What are the major Reasons of OST Corruption and how to Fix it
Confirmed user guide to Office 365 sign-in errors can log on to OWA (Office 365 webmail) without issue. Upon starting Outlook, error message displayed is "Errors have been detected in the file ," then prompt appears to locate (not fix) the OST file. Outlook 2016 connecting to Office 365 E3, mailbox size ~55GB and Outlook reghack effected to allow for ~80GB OST. If your computer faces unnecessary power outages during a process, it can be damaging. When Outlook is running and is halted in such a way, it can damage the OST file.
Open the OST file as per the location provided in the table.In certain cases, you must go for other methods to recover the data across OST files.Find solutions to common problems or get help from a support agent.This article offers to rebuild the OST file without putting you in any difficulty.
The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. I don’t have an answer to this other than to voice my suspicion that it is likely due to new Microsoft updates (windows and office). Find the .ost file that the error message reported to have errors, and then delete it and open outlook, it will recreate a new .ost file. With an OST file in your hand, you can even retrieve it if it gets corrupted.
Additional resources
Perfectly repair and recover corrupted Outlook PST & OST files. If the OST still gets corrupted when you have reduced the size there is something in the mailbox causing the problem. You must re-select "Account Settings" when it opens across a drop-down menu. There, lead into the "Data Files" tab and select your OST file. After selecting the file, click on "Open File Location" to redirect to the folder.
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