I cant start Microsoft Outlook or receive the error Cannot start Microsoft Outlook Cannot open the Outlook Window

The team is sweeping all remaining capacity to identify and address residual issues. https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-Ost-and-pst-files-2025-guide/ While these Microsoft accounts work in other Microsoft products (e.g. OneDrive, Windows, Xbox), they are non-functional when visiting Outlook.com. Outlook.com (the web version of Outlook) and Outlook apps require a 1st party alias (Outlook/Hotmail/Live/MSN) to send and receive email, use calendar, etc. For more information, go to Reduce attachment size to send large files with Outlook. If you’re having problems sending or receiving email, read how to Fix Outlook.com email sync issues.

With a background in computer science and a passion for writing, I thrive to deliver complex technical content in simple layman terms. Priyanka Kumari is a technical content writer in the fields of Email Migration, Data Recovery, Cloud Migration, and File Management. She is dedicated to simplifying complex technology terminologies for all users. Her articles and guides demonstrate her commitment to streamlining email management for professionals or businesses of any size. Run Wondershare Repairit for Email and click the “Select File” option to add the corrupted PST files.

Outlook may fail to open email due to corrupted Outlook profiles, add-ins, damaged OST/PST files, or outdated software.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.

Configure your antivirus software to exclude Outlook files or processes from real-time scans to avoid interference. Microsoft Outlook is one of the most widely used email clients globally, especially in https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-Ost-and-pst-files-2025-guide/ professional and business environments. Outlook also comes with strong built-in security features, making it a reliable choice for managing communication and workflow. To edit a shared calendar, go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device.

Your searches refer to this catalogue, so that you don’t have to check every single folder and email for a term. Existing Hotmail accounts have been permitted to keep their email addresses as well. You can still create a new email address with @hotmail.com as the domain name. This option could be useful if you constantly have to wait for Outlook to https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-Ost-and-pst-files-2025-guide/ rebuild its data file when you restart. To edit a shared calendar, go online to your own Outlook.com calendar, open Calendar for Windows 10, or use a mobile device.

Following the fixes above will help you keep your Outlook running smoothly and protect your productivity. We hope this guide proves useful in resolving your Outlook problems efficiently. Conflicting rules can prevent certain rules from working as intended.

We have mentioned all the possible troubleshooting solutions to fix the error. If none of the above doesn’t help you to resolve the Outlook stuck on loading profile problem. It’s a sign that your Outlook data PST file is damaged or corrupt. You can opt for the Microsoft inbuilt ScanPST.exe app to repair the Outlook data file. If your PST files are severely damaged, you can go for the PST Recovery Tool.

Users can effortlessly use https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-Ost-and-pst-files-2025-guide/ this software to recover their damaged or orphaned PST files in Outlook and resolve related errors. The topmost part of this wizard is that you can easily recover PST Files up to 80GB, or in simple terms, there is no limitation for file size. The password error issue of Outlook is the most frustrating error or glitch that users are facing nowadays. Outlook constantly shows an error regarding the password with a notification after closing it simultaneously. The reason behind the error is that users have to set passwords as the files may contain crucial information. Problems with the device, connection to power, network issues, viruses or malware, oversized files, and improper shutdowns all cause the PST file to act up.

Clearing the Outlook CacheExit Outlook and Skype for Business.From the Start menu, choose Run.In the Run window, type this path in the Open box “%LOCALAPPDATA%\Microsoft\Outlook\”Click OK.Find the .ost file and rename or delete it (you may need to Show Hidden Files and Show Extensions to see the file)More items…•4 days ago

These often help resolve issues without the https://fixoutlookhelp.wordpress.com/2025/10/29/repair-outlook-Ost-and-pst-files-2025-guide/ need to contact support. To access the calendar shared with your Microsoft 365 for business account, you’ll need to accept the invitation from Outlook on the web, iOS, or Android. If you’ve already clicked the Accept button in Outlook 2016, you won’t be able to re-accept the invitation from another Outlook application.

For more information about when builds are available for their respective channels, go to Update history for Microsoft 365. We’re investigating the issue and will update this page when a fix is available. After installing the September Public Update, Outlook 2007 displays mixed languages in the user interface.