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January 21, 2026
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Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running. If so, wait a short time (usually two or three minutes) to see if Outlook starts working again.
Are you having trouble starting Outlook or receiving "Cannot start Microsoft Outlook. Cannot open the Outlook window" error messages? We can fix the problem for you, or you can use the troubleshooting steps we're providing below to help resolve these startup issues. Should you decide to remove a profile, back up the data files first.
There are problems starting Outlook. How about we start with just the basics?
Find solutions to common problems or get help from a support agent. Please go to Create an Outlook profile for steps on how to create a new Outlook profile, then continue with how to use a different profile. If you can't choose any of the menu options, type inside an email message, calendar event, or contact, Outlook may have frozen. There are three steps you can take to try to get Outlook working again. With the window with the Windows Update, you will see all the updates you need to make for your Microsoft Office. Compatibility mode is suitable for older software with Windows 10 that fail to run normally.
Microsoft 365 Outlook Won't Open: Troubleshooting Tips
If you would like for me to fix this issue using our Secure Remote Assistance then customer care can setup a new case for us. You can determine if it's corrupted by creating a new profile and changing which profile is used when Outlook starts. Use the classic Outlook startup troubleshooter to diagnose and fix several common classic Outlook for Windows issues for you. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. If you restart it successfully, it will show you that one or more add-ins are defective. Now, it's time to uncover them by the elimination process.
Try to restart your computer and check if this corrects the problem, if not, you might need to repair your MS Office.Please go to Create an Outlook profile for steps on how to create a new Outlook profile, then continue with how to use a different profile.When Outlook does open, it will send mail fine one minute and then the next minute it will not send any mail.Follow the steps below to download the uninstall support tool according to your browser.With great functionality, you can manage your email, contacts, calendar as you like.A vast community of Microsoft Office365 users that are working together to support the product and others.
Make sure you have permissions for PST file
The only thing is to know how to overcome them when they arise. Whether it's defective add-ins, frozen Outlook, faulty data files, and many others, you can manage all these problems yourself. Knowing the cause of the problem will help you sort out all the issues related to Outlook opening. Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. You Outlook profile repair and recovery steps can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors.
Do you see the message "This set of folders could not be opened"?
A well-running Outlook will ensure that you enjoy the full benefits of this popular email program. If you follow the above solutions, your Outlook will perform according to your expectations. If the in-box Program cannot fix the corrupted Outlook PST files, you can also try Wondershare Repairit for Email. It is a powerful and almighty software that can be applied to fix corrupt Outlook PST files in any scenarios. Hello, you have reached JustAnswer.com, thank you for utilizing our service. My inbox repair tool alternative goal is to provide you with excellent service.
If this isn't what you were looking for, please respond and we can continue to troubleshoot until we find the right answer. Welcome to JustAnswer.com, an independent, paid-support, question & answer service that is not affiliated with any other company. Sorry to hear you're having problems, my name is David, and I will do everything I can to help you find the information you need. Running the /resetnavpane command removes all customizations to the navigation pane.
Wondershare Repairit for Email
This goes to prove that the problem came from your original Outlook profile. If you are figuring out how to fix "Outlook Not Opening," you will find several possible solutions. The best part is that you are spoiled for choice because some are quick to implement while others are Microsoft Outlook Email Repair Tool Online time-consuming. This section introduces solutions that you can use when Outlook 2016 or Outlook 2013 is not opening.
Find out defective add-ins while in the safe mode
Microsoft Outlook provides a better experience for users. With great functionality, you can manage your email, contacts, calendar as you like. Check the solutions to fix "Outlook not opening" problem and how to avoid "Outlook won't open" again.
Does classic Outlook stop running or refuse to start?
Click the above link to have a quick download, then you can have Outlook errors fixed within minutes. A vast community of Microsoft Office365 users that are working together to support the product and others. I understand that your Office applications are not working.
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January 21, 2026
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This blog talks about the causes behind Outlook synchronization errors and a few solutions to fix Outlook sync issues. We have shared five manual methods in this blog to resolve the Outlook syncing errors. Apart from this, we also discuss the Shoviv OST to PST Converter Tool, a professional way to repair, recover, and convert Outlook data files. This solution will be FixTechGuide Outlook repair tutorial beneficial for users who are facing Outlook syncing issues because of corrupted PST or OST files.
Turn off Windows Defender Security Center
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. FixTechGuide Office 365 troubleshooting I’ve unchecked download shared folders when setting up a new Outlook profile. After performing these steps, Outlook’s all folders will be synced to the server. If this method doesn’t work for you, navigate to other solutions. Select the button below to launch a diagnostic in the Microsoft 365 admin center.
Check if two-factor authentication is turned on for your account
If your password is incorrect, you'll see a message asking you to update your password. If you're using an Outlook.com, Microsoft 365, or Exchange account, you won't have advanced mailbox settings unless the account was set up using advanced setup. 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. Once you have completed the steps to fix Outlook sync errors, kindly check if the error has been fixed or not. 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.
Check Antivirus and Firewall Settings
I’ve tried the Microsoft office uninstall tool provided by Microsoft (which deletes more items then just control panel uninstall).It is possible for a corrupted Outlook profile to impede synchronization.Incorrect Outlook settings can also be one of the reasons behind Outlook synchronization errors.I’m at wits end and Microsoft stopped helping me because they feel the problem is on our end.It verifies your identity using your password and a contact method (also known as security info).Here, we will discuss the five manual methods to fix sync issues in Outlook or OWA.If you still can't sync your email after removing your account and adding it again, you might need to add the account using advanced setup.
However, in some situations these processes can take up to 24 hours. We're in the process of migrating from On-Premise Exchange to O365. I solve Office 365 mailbox sync delays 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.
Free Methods to Remove Duplicate Items in Outlook 2016
The Mail and Calendar apps for Windows 10 don't support two-factor authentication. If two-factor authentication is turned on for your account, you'll need to create an app password for that account. An app password is used instead of your normal account password for apps that don't support two-factor authentication. Before you begin, make sure that your device has the latest operating system and app updates. Try the general troubleshooting solutions in Troubleshooting Mail and Calendar apps for Windows 10. I regret that you are experiencing issues with your Microsoft Outlook slow synchronizing inbox message, and need help speeding up.
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January 13, 2026
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It is located in the folder of your original Personal Folders (.pst) file. If you can't start the Inbox Repair tool automatically or manually, you may try to repair your Office application. At a higher level, the more visible changes that FixTechGuide Outlook repair tutorial you see involve folders and messages. If ScanPST determines that a specific block of the structure or table is unreadable or corrupted, ScanPST removes it. If that block was part of a specific item in Outlook, the item will be removed when it is validated.
Also, this specific kind of situation is rare, and it will always be entered in the ScanPST log file.Regular maintenance and backups are key to preventing future issues.The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape.The software also repair password protected PST file and recover data successfully.
Step 1 - Exit Outlook and start the Inbox Repair tool
Fixing corrupted Outlook PST files without losing data is achievable with the right tools and techniques. Start with ScanPST.exe for minor issues, escalate to third-party software for complex corruption, and use manual methods as a last resort. Regular maintenance and backups are key to preventing future issues. By following these steps, you can restore access to your Outlook data efficiently flush DNS and re-sync Outlook and securely, ensuring uninterrupted productivity. ScanPST mostly validates and corrects errors in the internal data structures of a .pst file.
Step 2: Select the PST File
Therefore, structures such as BTrees and reference counts, are checked and repaired as necessary. These low-level objects have no knowledge of the upper-level structures, such as messages, calendar items, and so on, that are built upon them. After you run the Inbox Repair tool, you can start Outlook and recover repaired items. Optionally, you can try to recover additional repaired items from the backup personal folder.
Step 2: Load the Corrupted PST File
To start, create a new Personal Folders (.pst) file entry in your profile. Then, you can move the recovered items to your new Personal Folders (.pst) file. To start Outlook OST Vs PST Repair the Inbox Repair tool manually, locate one of the folders by using Microsoft Windows Explorer, and then double-click the Scanpst.exe file.
Method 3: Manual PST File Recovery
If you can open the original Outlook Data File, you might be able to recover additional items. The 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. There may be items in the backup file that you might be able to recover that the Inbox Repair tool couldn't. Remember that the backup file was the original corrupted file, and you may find that you cannot recover anything other than what was recovered in the Lost and Found folder.
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January 13, 2026
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The Microsoft 365 Copilot app brings together your favorite FixTechGuide fix for stuck folders 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 to help you get things done.
Billing and subscription management support
Assistance for billing and subscription management issues is available online or by telephone during China business hours (Beijing Time), Monday through Friday. Billing and subscription management support can be accessed using the same phone number and online service request process as with technical support. The support telephone number can be found on the Microsoft 365 operated by 21Vianet portal. 2 Severity A is only available to customers who signed an advanced online service agreement with 21Vianet through a sales account manager.
Open an online request
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 use the Microsoft 365 operated by 21Vianet portal to submit service requests online and access support telephone numbers. We can help you find a solution or connect you to technical support.
More apps in one place
If your country/region isn't listed, select a neighboring country/region or dial the United States support phone number. For a smoother support experience, we recommend that you open separate support requests for each issue. You must have at least one subscription bought through Microsoft to access Microsoft support.
Microsoft 365 Customer Service and Support
Microsoft 365 Basic now comes with 100GB of cloud storage, secure photo and file storage, secure ad-free email, and technical support.Explore learning tools to collaborate on projects together and independently, all in one place.Assistance for billing and subscription management issues is available online or by telephone during China business hours (Beijing Time), Monday through Friday.Authorized administrators can use the Microsoft 365 operated by 21Vianet portal to submit service requests online and access support telephone numbers.Initial response time is based on the severity levels described in Technical support case handling.The Microsoft 365 operated by 21Vianet technical support team troubleshoots only those issues that are related to Microsoft 365 operated by 21Vianet.Technical support for Microsoft 365 operated by 21Vianet subscriptions provides assistance with basic installation, setup, and general technical usage.21Vianet also expect customer to collaborate at reasonable level accordingly.The Microsoft 365 Copilot app empowers your employees to do their best work with Copilot in the apps they use daily.
Issues that originate in customer networks fall outside of the Microsoft 365 support boundaries, and in these cases, customers must work with their networking team for assistance. The administrator is expected to provide initial assistance for the customer's users. However, if the administrator is unable to resolve issues with the help of self-service support resources, they should Contact support. Technical support for Microsoft 365 operated by 21Vianet subscriptions provides assistance with basic installation, setup, and general technical usage. If you're a volume licensing admin but are unable to access the admin center, you can create an online support request. With every subscription of Microsoft 365 operated by 21Vianet, 21Vianet support provides technical, presales, billing, and subscription support.
For business
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. It can also depend on if you want help for an issue with a service like OneDrive or Outlook.com, or help with Windows, but you don't have an existing Microsoft 365 subscription. Anyone in your organization can quickly create documents, presentations, and worksheets within a single, unified app experience. Empower your organization with Microsoft 365 Copilot Chat that supercharges productivity, sparks creativity, and keeps your data protected with enterprise data protection. Microsoft 365 Basic now comes with 100GB of cloud storage, secure photo and file storage, secure ad-free email, and technical support.
Self-service support is available for all Microsoft 365 operated by 21Vianet users, and includes troubleshooting tools and videos, help articles and videos, as well as forums and wikis in the Microsoft 365 community. For more self-help resources, see Microsoft 365 operated by 21Vianet. 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.
Microsoft 365 support plans for business and enterprise
21Vianet understands that receiving timely technical support from qualified professionals is a key aspect of cloud services. Equally important is the critical role that the customer's IT department plays in the support of its users. The Microsoft 365 operated by 21Vianet technical support team troubleshoots only those issues that are related to Microsoft 365 operated by 21Vianet.
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. This service description uses the generic title administrator to refer to all categories of administrators.
Check out all of our small business content on Small business help & learning. For more information about the availability of support throughout the life of your product, visit the Microsoft Lifecycle Policy. See the table below for the type of support you can get depending on your product.
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December 26, 2025
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It’s just strange that this is happening to everyone regardless of Outlook version (2016 and 2019) or Windows version (Windows 7 and Windows 10). I just went on the apps page and disabled "allow users to install 3rd party apps," while keeping the Microsoft app installs enabled. Compliance reached out to me and said users should only be able to freely install Microsoft owned apps on o365. This applies to teams and outlook and office apps.
How do I disable outlook add-ins
Oftentimes in the disabled add-in box is Adobe Send & Track or Adobe PDF Maker, but also sometimes Salesforce for Outlook, which we need to continue to have enabled. We decided to discontinue the outlook plugin service. I would like to know how to disable/remove the plugin for users who already have it installed. To block add-ins that are not managed by this policy setting, you must also configure the Block all unmanaged add-ins policy setting. Yes, I’ve been disabling them from the Outlook menu, but a select few keep re-enabling themselves.
Outlook: Disable Outlook COM add-ins
In these cases, the cause of the crash or the loading failure needs to be fixed together with the add-in owner. I’m back in the office now after a week and this is still going on. It’s interesting that O365 and CTR users seems to be effected because the majority of the affected users in our office are Outlook 2016 or 2019, not O365 (though I think 2019 is CTR). To disable certain add-in, locate to the add-in under Addins, in the right panel, there is a subkey named LoadBehavior, set the value to ‘2’ to disable it. Exploring this admin page, i see that I'm able to make policies for each reset cached Exchange mode o365 app. Have questions or feedback about Office VBA or this documentation?
Support and feedback
In these cases, the cause of the crash or the loading failure needs to be fixed together with the add-in owner.It’s interesting that O365 and CTR users seems to be effected because the majority of the affected users in our office are Outlook 2016 or 2019, not O365 (though I think 2019 is CTR).To disable certain add-in, locate to the add-in under Addins, in the right panel, there is a subkey named LoadBehavior, set the value to ‘2’ to disable it.All the guides I've found online start with "go to the Tools menu".If you re-enable an add-in that caused a performance problem at one time, users may experience performance problems in the future in the Office program for which the add-in is loaded.Beginning with Office 2013, system administrators can configure an enhanced level of control for add-ins by using group policy.
I was under the impression that this "let users access third party apps in your tenant" was all encompassing and would disable all 3rd party apps / add-ins for all o365 apps. Now when I open teams i can clearly see that 3rd party apps need to be requested but ms apps can be installed without issue. The user has control over which add-ins run on their computer. Beginning with Office 2013, system administrators can configure an enhanced level of control for add-ins by using group policy.
Preventing add-ins from being disabled
I’ve got a problem with Outlook for users in the office that expert Outlook tips by FixTechGuide addins keep crashing Outlook. I disable all addins on the users machines but the addins keep re-enabling themselves. If you re-enable an add-in that caused a performance problem at one time, users may experience performance problems in the future in the Office program for which the add-in is loaded. Unfortunately I don’t have an answer for this but I’m +1’ing it for needing a resolution. We’re on the Monthly build of Office 365 (click-to-run). This started happening a week or so ago, but it’s becoming increasingly annoying.
Support for keeping add-ins enabled
Please see Office VBA support and feedback for guidance about the ways you can receive support and provide feedback. To disable all the add-ins, just use Group Policy inbox repair tool alternative to delete or rename the Addins to OldAddins.
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