If you can't open Outlook, or Outlook disappears or crashes, one of your add-ins may be to blame or you may need to update Outlook.

Method 5. Disable Third-Party Add-ins

• Your program worked fantastic, and I successfully converted the .ost into .pst having back my old e-mails.
• I couldn't have done it without putting all the comments together.
• Recovery Toolbox worked very well and relatively quickly.
• Hope this helps and this was definitely the true fix I was struggling to find.
• Find the Microsoft 365 app and right-click on it to see the available options.
• Follow the prompts to complete the repair process.
• Here are some of the reliable methods to restore Outlook 365 not working issue.
• It allows users to restore even large-sized PST files that are often not compatible with other tools.

I need to convert a large .ost file to a .pst file to set up a new laptop. Recovery Toolbox worked very well and relatively quickly. Had to re-install windows.I want to recover all pst, and ost. My PST got corrupted as it grew too large.

Repair an Office application

The only way to resolve Fix Office 365 password reset problems this issue is to repair Outlook 365 in Windows 10. But the problem arises when you don’t know the correct way of doing it. The steps to access the repair tool vary depending on your operating system.

Method 6. Using Microsoft Support and Recovery Assistant (SaRA)

Tried many other recommended solutions but none were able to help with the recovery apart from the recovery toolbox for outlook. There are many methods to repair Microsoft Outlook 365, but none can deal with highly corrupted PST file. In such case, Kernel for Outlook PST Repair tool comes in handy.

Want more options?

You might need to set Windows Update to automatically download and install recommended updates. Installing any important, recommended, and optional updates can often correct problems by replacing out-of-date files and fixing vulnerabilities. To install the latest Windows and Office updates, click the link below. If a Microsoft 365 application such as Word or Excel isn't working correctly, sometimes restarting it will fix the problem. If that doesn't work, you can try repairing it. When you're done, you might need to restart your computer.

Is classic Outlook frozen?

The Outlook Online Repair Service allows you to repair corrupted PST/OST files on any device (desktop, tablet, phone) with any OS (Windows, Android, macOS, iOS and so on). The PST Online Repair Service does not require Microsoft Outlook to be installed and does not need to have any third-party software installed on your device. Also, you can recover permanently deleted items and attachments from Outlook with the help of this Outlook repair tool. You can even migrate PST files to Office 365, email servers, and web email clients with the help of this software. The file I was trying to repair, had nothing wrong.

Uninstall and reinstall the new Outlook for Windows

So, I used Toolbox recovery to convert the pst file in msg, ans I copied and paste the msg files in Outlook, and it worked perfectly. I wanted to send a large pdf file (20Mb).While sending I disrupted this process (turned off pc?). As a result I had an unclosed mail in my pst-file. As a result my pst-file was corrupted and my outlook could no longer be started/opened.This tool fixed PST-file. If you don't have a Windows computer with the desktop version of Outlook installed, then you can repair a corrupt PST file by using a special online service here.