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Outlook may fail to open email due to corrupted Outlook profiles, add-ins, damaged OST/PST files, or outdated software. Antivirus conflicts and system issues can also cause startup errors or loading failures. This startup issue often appears when profiles get corrupted, damaged Outlook files, add-ins conflicts with system updates or antivirus. Should you Why Is Outlook Not Opening 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 issues are solved then try to relaunch Outlook or perform system file tracking. Outlook stores all your email messages, meetings and events, contacts, and tasks in data files. You can run the Inbox Repair Tool (scanpst.exe) to scan your Outlook data files and repair errors. 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.  
  
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You can start Outlook in safe mode, disable your add-ins, and then try to open Outlook normally. You might need to set Windows Update to automatically download and install recommended updates. To install the latest Windows and Office updates, click the link below. It is always recommended by Microsoft to end the process which is running in Why Is Outlook Not Opening the background. The above solution will help you to resolve the Outlook Stuck at Loading Profile error. Sometimes, a weak or unstable internet connection can cause Outlook to misbehave.  
  
To sum up, we explored several methods to fix "Outlook won’t open" errors. Whether it’s a profile issue, a corrupted PST file, or faulty add-ins, the methods above can help you get Outlook running again. When Microsoft Outlook refuses to open, it’s incredibly frustrating. This issue often stems from common culprits like a corrupted user profile, a damaged data file (PST or OST), or even a minor conflict within its settings or add-ins. The good news is that most "Outlook won’t open" errors can be resolved with a few proven troubleshooting steps.  
  
Unfortunately, none of these actions have resolved the problem. Other users in my company do not experience this issue, which makes me suspect that this is a user account-specific problem. Your profile stores a variety of settings that control how Outlook looks and feels. You can create a new profile and then add your email accounts to the new profile. If you try to delete or move a large number of messages at once, Outlook can appear to freeze, but really, it's working behind the scenes.  
  
Creating a fresh profile can provide a clean slate for Outlook to start. Yes, you can often fix Outlook without reinstalling Office. When you install Office, an Inbox Repair Tool (SCANSPST.EXE) is also installed on your PC. The Inbox Repair Tool can resolve issues by scanning your Outlook data files and repairing errors. If Outlook does not start then press Win+R and type Outlook.exe/safe to launch Outlook in safe mode. Disable faulty Add-ins, repair data files with ScanPST or create new Outlook files.  
  
Maybe you've added a new program to your computer that doesn't get along with Outlook, or your system has a virus. Regardless of the specific cause, there are several key troubleshooting fixes to try that might help. If you try to delete or move a large number of messages at once, Outlook can appear to freeze, but really, it's working behind the scenes. If Outlook is performing some operation on hundreds or thousands of messages at once, it might appear to be stuck.  
  
This can include Outlook.com (the free web-based email service), Outlook as part of Microsoft 365 (formerly Office 365), and the standalone Outlook desktop application available for Windows and macOS. The support status can vary depending on the specific version of Outlook, the platform it’s used on, and whether the user has a subscription to Microsoft 365 or a standalone license. Why Is Outlook Not Opening Outlook support for Hotmail is the customer service and technical support provided for Hotmail accounts accessed through Microsoft Outlook. Hotmail, which was rebranded as Outlook.com in 2013, is now part of the Outlook web email service. This means that users with existing Hotmail accounts can use them within the Outlook.com interface or through the Outlook applications available for desktop and mobile devices.