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  • Federico McGowan
  • janina2008
  • Issues
  • #5
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Issue created Nov 06, 2025 by Federico McGowan@federicomcgowaOwner

Repair Outlook Data Files pst and .ost

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. If you lose your connection to the internet, classic Outlook won't be able to send your messages. To fix this problem, on the ribbon, select the Send/Receive tab, then, in the Preferences group, select Work Offline to toggle between offline mode and online mode. You may need to open the message and send it again or choose Send/Receive. On the Outlook status bar, if you see Disconnected, Working Offline, or Trying to connect…, then Outlook can't reach the email server to send your mail.

When you're done, you might need to restart your computer. Click Options and select any Log file option, then click OK. This free application can quickly detect and fix issues with Outlook, Microsoft Office, Microsoft 365, and Microsoft Teams. Whether your Outlook is unresponsive or frequently crashes, this program can help you troubleshoot and fix the root cause of the problem with ease. If you’re experiencing any issues with Outlook on your Windows 10 system, there’s no need to panic. When Outlook is not working, or Outlook keeps crashing pondering upon the cause won’t be of use unless it is a regular issue.

If you can send email while Outlook is in safe mode, creating a new Outlook email profile should allow you to send email again. Should you 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).

3 answersClose Outlook.Press Windows + R to open the Run dialog box.Type Outlook.exe /safe and press Enter.If Outlook starts in Safe Mode, try disabling add-ins by going to File >Options >Add-ins, then disable all add-ins and restart Outlook normally.Aug 29, 2024

Although add-ins can enhance your user experience, they can occasionally interfere or conflict with Outlook. Make sure that the latest updates for Outlook are installed. For more information, see How to install the latest applicable updates for Microsoft Outlook (US English only).

If Outlook is still not working correctly even after restarting it, then you could try repairing the program and restart your computer afterward. Outlook is one of the most complex applications of the Microsoft Office suite, which makes it extremely resource-hungry. Outlook may hang ways to fix Outlook data file errors simply because it does not have enough memory to run or perform a required operation. This is often the case with outdated and low capacity PCs, however even modern and powerful ones cannot feel secured against this.

As @ode2joy ​ said, clearing out the user’s profile usually works, which is a more thorough procedure than just deleting .nst and .ost files. When something goes wrong with Outlook, Microsoft ways to fix Outlook data file errors recommends that we start it in Safe mode. Simply that Outlook will be loaded without your add-ins and customization files. Originally, the freezing would only occur when I actually tried to do something. So, if I tried to open a message, search my inbox, write a new email, go to the calendar, etc., it would freeze up for about 5-10 seconds at a time. The freezing never seemed to occur when I had Outlook open but was not using it.

Start classic Outlook in safe modeIn Windows 10, click Start.Type Outlook /safe, in the Search programs and files and then click OK.Close and re-open Outlook.If the issue is resolved, you can keep working, or if you have time, take the following steps to find out what COM Add-in is causing the problem.

The Inbox Repair Tool is an in-built utility from Microsoft ways to fix Outlook data file errors to overcome the Outlook PST file corruption issues. Users can fix Outlook PST files using this utility, but firstly you need to locate the Inbox Repair Tool (ScanPST.exe) in their system. We are going to share a table below with the default location of this utility for different Outlook versions, like Outlook 2010, 2013, or 2019.

If you can't find a dialog box open, move on to the next step. There’s nothing in particular to warn you about, as there are many informational and diagnostic information there, but reading the entries may lead to a clue about what’s going wrong. Note that you can sort by clicking on the Source column. Be sure to look where both Outlook exited and when it was restarted. Do you have another machine you can try to duplicate the problem on, preferably with a configuration that is as close to possible to the machine that has the problem? Identifying patterns helps to diagnose what the problem might be.

This software is integrated with powerful scanning and repair algorithms that can easily resolve all Outlook email errors and repair personal folder file non-invasively and efficiently. Moreover, the utility supports the all latest Outlook versions such as 2021, 2019, 2016, 2013, 2010, 2007, and all lower versions in Windows OS. If you manually type in the ways to fix Outlook data file errors secondary connected account email address in the "From" field, the email is sent as "On behalf of" your primary Outlook.com account.

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