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. Your Outlook profile holds all your account settings and data configurations.

This fix will also lead to a reduction in the total number of contacts on your contact list. We will ensure that all information is retained and only contacts with matching information in all fields will be cleaned up. To check if you have received the fix, review your contact list to confirm duplicates have been removed. If you used the workaround below you can now switch from using an Outlook.com alias https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html to your country's domain. Then, each item in your calendar folder is checked for known problems that can cause unexpected behavior, such as meetings that seem to be missing. There is currently no option to revert to the prior behavior, but we would love to hear your feedback to help us with future designs.

I have shared 8 different solutions that https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html can help you fix Outlook errors like Outlook not responding. I hope the information shared above will be helpful for Outlook users. For older Outlook versions (2007 and earlier), make sure your send/receive settings are correctly defined.

Do not forget to add the Outlook application and its add-ins to the trusted list of your Antivirus program. If still, you are facing the same issue, maybe you should try to turn off the Antivirus program and check if Outlook is working fine. If it is, this means your Antivirus program is causing this problem. To resolve this issue, make sure the Antivirus program you are using is updated. If you are using an outdated or over-protective Antivirus software, it may conflict with Microsoft Outlook or any of the Outlook add-ins you have installed. Consequently, the Antivirus program will block the add-ins and stop Outlook from functioning properly.

Simran Bhatia is a technical content writer engaged in writing clear, concise, and SEO-optimized content. This method using the SCANPST.EXE will not work if the PST Files are in bulk or they are encrypted. In that case, using a professional tool comes to your rescue. After performing the steps, check if the error persists. Remember to re-enable your antivirus once Outlook is working properly. It helps to resolve the issue and get your Outlook up and running smoothly.

To learn more about how to send us feedback, please see How do I give feedback on Microsoft Office. Another options is to use the Filter Email button on the ribbon. You may notice that All, Unread , Mentioned and other sort and filtering options, such as By date, and Newest are missing in Outlook above your email list. The loading of unregistered MAPI services has been disabled by default to make Outlook more secure.

When Microsoft Outlook is installed on your computer, numerous files, registry entries and configurations are set up to make sure the program runs smoothly. If any of these components are missing or corrupted during installation, Outlook may fail to open or could crash unexpectedly. You can determine if it's corrupted by creating a https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html new profile and changing which profile is used when Outlook starts.

You just need to install the software and you are all good to run the software. With the demo version itself, you can recover and see the recovered data. I used to - now https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html they are just stuck on loading when I double click on them.

When you do this, your Outlook https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html might have opening problems. For this reason, you should always turn off Compatibility mode for Outlook. 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.

Keep in mind this does take a while, https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html and it’s usually best done after the user has left for the day. Sometimes you’ll open Outlook and then for no apparent reason, it will freeze or shut itself down. There are quite a few different causes for this, but one of the most common is a defective add-in. Here’s how to disable add-ins in Outlook even when it keeps crashing.

Add an Outlook.com alias to your account and send email to Gmail users using that alias. For https://office365emailfix.blogspot.com/2025/10/fix-outlook-not-sending-or-receiving.html more information, go to Add or remove an email alias in Outlook.com. If you're still unable to send or receive email, read how to Fix Outlook.com email sync issues.

Keep in mind this does take a while, and it’s usually best done after the user has left for the day. In many organizations, Outlook is one of the most common and core programs that are used from day to day. Fortunately, with the right Outlook troubleshooting strategies, many of the most common Outlook problems are quite straightforward to troubleshoot. Below, you will see some of the most common issues that users run into, and what the most efficient way to troubleshoot Outlook is.