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.

Additional resources

• My PST got corrupted as it grew too large.
• I exported from Oulook 365 a folder with a lot of e-mails, ans had a .pst 2,28 Go file.
• You'll most likely see a bright yellow box saying "unable to log-in at server"...IGNORE this and go ahead n click "Done".
• It is the best PST repair software to repair and restore data from corrupt PST or password-protected files.
• You can save recovered PST data to DBX, MBOX, MSG, EML, TXT, RTF, HTML, and MHTML formats.
• As a result my pst-file was corrupted and my outlook could no longer be started/opened.This tool fixed PST-file.

Simply I wrongly backed-up my old e-mail history in a .ost file instead of a .pst file, and I needed to check some of the e-mails contained in that file. Your program worked fantastic, and I successfully converted the .ost into .pst having back my old e-mails. The source file was not damaged I was converting my laptop from imap to pop email. I used your tool to convert the imap .ost file to .pst. Had my agenda only in the ost, so not synched to the webmail.After making a new profile my agenda items were gone. Used the Recovery tool for Outlook to restore the items to a PST from a backup of the old OST files.

Method 2. Recreate a New Outlook Profile

All these methods are effective in resolving the issue. However, these methods are a little bit risky and time-consuming. To avoid risk and time, you can use our recommended tool as Common Outlook errors explained it has excellent features that can help you restore your corrupt or damaged PST files easily.

Troubleshoot Outlook for Windows issues

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.

Repair your .pst file in classic Outlook

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.

Have to modify/repair Outlook almost every day to fix it from closing and not reopening. Anyone know what it could be?

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.