
I couldn't have done it without putting all the comments together. Then the next Microsoft window will appear asking if you want to "Let this app (Tbird in this case) access your info 1 of 1 apps"...click "Accept". One of Thunderbird's core principles is the use and promotion of open and decentralized standards. 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.
Automated Tool to Repair Outlook PST (Recommended Solution)
- This free application can quickly detect and fix issues with Outlook, Microsoft Office, Microsoft 365, and Microsoft Teams.
- There can be instances that your Outlook profile is corrupted, recreate a new Outlook profile to resolve the issue.
- I need to convert a large .ost file to a .pst file to set up a new laptop.
- Recovery Toolbox for Outlook can also fix 2GB error PST files.
- I could of course import the pst file in Outlook, but I did not wanted to do that, in order to avoid duplicates in Outlook.
- In the Run dialog box, type "firewall" and click OK.
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.

Common Issues Which Stop Outlook from Opening on Windows 10
The only way to resolve reset microsoft 365 login credentials 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.
Troubleshoot Outlook for Windows issues
How do I repair my Outlook 365 client?
If you’re experiencing any issues with Outlook on your Windows 10 system, there’s no need to panic. Find the Microsoft 365 app and right-click on it to see the available options. You will see two options – Change and Uninstall. Click the Change option to repair Office 365. Hope this helps and this was definitely the true fix I was struggling to find.
Comparison of PST file recovery tools and services: test results based on real data
The trial version of the software is also available for free download, so you can try it before purchasing the full version. The Recovery Toolbox for Outlook technical support team can be a last resort in difficult cases. The development team can individually analyze the corrupt file and recover the maximum amount of data from the corrupt Outlook file. Technical support for the first year is included in the program price. The Microsoft Outlook Inbox repair tool includes an online version, found here.
Method 1. Using Microsoft Quick Repair

This worked well although only the agenda item are restored, not the attachments and extra information field. If all the above steps failed, then use the Outlook Inbox repair tool to repair the PST file and replace the corrupted PST file in the Mail profile of Windows. It is mandatory to try all the free steps before using the Recovery Toolbox for Outlook. Do not use the Outlook Fix Tool until you have tried all of the above options. I exported from Oulook 365 a folder with a lot of e-mails, ans had a .pst 2,28 Go file. I could of course import the pst file in Outlook, but I did not wanted to do that, in order to avoid duplicates in Outlook.
Check for other processes running under classic Outlook
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.