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4185fix-outlook-troubleshooting-hub
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Opened Mar 05, 2026 by Rachel Philipp@rachelphilipp
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I cant start Microsoft Outlook or receive the error Cannot start Microsoft Outlook Cannot open the Outlook Window

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. 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. Find solutions to common problems or get help from a support agent.

In this case, you can reset your view settings before opening the Fix Outlook Support app. Select your Microsoft Office installation on the list and choose "Change" at the top. In this case, open Outlook in safe mode where your add-ins aren’t loaded and remove any suspicious add-ins. In most cases, Outlook doesn’t tell you why it isn’t opening, which leaves you guessing as to what has caused the issue. Due to underlying system or PST issues, Outlook may crash, freeze, or not function properly. Find solutions to common problems or get help from a support agent.

We will be delving into exploring the powerful methods to fix Outlook PST files in the following paragraph. In addition, it turns into leading Outlook errors, which might affect overall productivity and efficiency and can Fix Outlook Support increase downtime. Therefore, users should put some effective solutions into action to deal with inaccessible or damaged PST files as soon as they encounter Outlook issues.

In some specific cases, we observed that the problem no longer stayed after deleting the Outlook App Data folder. Thus, you can try deleting the Outlook App Data folder and check whether Outlook functions in your case; follow the below process. After the scan is complete successfully, try to open Outlook 2016 again and check if it throws the same error message or is now working perfectly. Now, launch Outlook 2016 again and check if the issue persists or not, and if it does, you may follow up with other workarounds given below. You can choose to repair the program both online and offline, whichever solutions suit you best.

In this case, you’ll have to remove your app’s cache to resolve your issue. Should you decide to remove a profile, back up the data files first. All offline cached content will be deleted when you choose Remove. For more information, see Introduction to Outlook Data Files (.pst and .ost). If your issue with Outlook persists, use the repair tool’s "Online Repair" option to fix your app problems. This option takes longer than the first one and requires an active internet connection to resolve your app issues.

However, in most cases, the changes will reflect almost instantly. If you are using Gmail or Google Workspace as well as the Outlook calendar, it would be nice to have them populated with the same information. Here is how to make sure your Outlook is showing the same information as your Google Calendar. It might be that antivirus software is trying to block a function that is repeatedly trying to squeeze Fix Outlook Support through the firewall.

Follow the on-screen instructions to update your Office apps. Then, launch your Outlook app, and it should open without problems. If your PC has a virus or malware infection, that may be why Outlook isn’t launching. In this case, run a full virus check on your PC to find and remove any threats.

But the good part is, you can fix most of these problems with simple steps. TrustedTech is a Microsoft solutions Partner in the following areas. You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally.

ScanPST can only repair and fix minor corruption and issues in Outlook files. If your Outlook data files have gotten severely corrupt or extremely damaged. Then, you need to try specialized Outlook PST repair tools.

Follow the prompts to complete the installation process. Find the Microsoft 365 app and right-click on it to see the available options. You will see two options – Change and Uninstall. A vast community of Microsoft Office365 users that are working together to support the Fix Outlook Support product and others. Select faulty or incorrect add-ins and click Remove.

The Inbox Repair tool checks the Outlook data files on your computer to see if they're in good shape. The last option in this list is to repair the Outlook data file. In Fix Outlook Support this article, we will teach our readers how to repair outlook with proven methods.

Running the /resetnavpane command removes all customizations to the navigation pane. It's not uncommon, and you can easily make Microsoft's email and calendar app open with a few simple fixes. We’ll show you what to do on your Windows 11 or Windows 10 PC.

It is therefore crucial that these Outlook errors are resolved as soon as possible. This guide discusses methods to quickly fix the Outlook not opening issue in Windows 10. To repair the PST files, you can use the in-built tool ScanPST, which is provided by Microsoft, but it repairs minor corruptions and files up to 2GB only. So you can opt for an automated solution – Kernel for Outlook PST Repair.

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Reference: rachelphilipp/4185fix-outlook-troubleshooting-hub#5