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  • Bernadette Rasheed
  • 7963433
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  • #11

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Opened Nov 03, 2025 by Bernadette Rasheed@bernadetterash
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Classic Outlook not responding, stuck at "Processing," stopped working, or freezes

When you install Outlook, an Inbox repair tool (scanpst.exe) is also installed on your PC. The Inbox repair tool can resolve problems by scanning your Outlook data files, and repairing errors. To use the Inbox repair tool, exit Outlook, and then follow the steps in Repair Outlook Data Files (.pst and .ost). In the first place, check whether your antivirus is up-to-date. If the above does not help, turn off the antivirus and troubleshooting Outlook startup issues see if it brings Outlook back to life.

If it does and Outlook starts working properly, then most likely the problem is with one of your add-ins, which leads us to the next step. The browser version isn’t impacted by local Outlook files or add-ins. When opening certain messages, Outlook might be loading content from the internet. This can result in delays or even a full Outlook freeze on slower connections. Outlook freezing or becoming unresponsive isn’t just frustrating—it can derail your entire day.

Ashila is a passionate researcher and troubleshooting Outlook startup issues writer specializing in diverse technologies. She also explores topics related to startups and entrepreneurship. With a keen interest in industrial growth and technical innovations, Ashila leverages her expertise to create insightful content that bridges technology and business development.

However, for severely corrupted PST files, it’s recommended to use a third-party repair tool. In this regard, we recommend Kernel for Outlook PST repair tool to save your precious time. Do you know that Microsoft Outlook is the most complex program in the Office suite? Sometimes Outlook keeps freezing just because there are so many other applications opened on your computer. Generally, Outlook hangs on loading profiles or performing any other operation because it is not getting enough memory.

Occasionally, classic Outlook tries to run a process in the background. Auto-archive, sending and receiving a very large attachment, or running some of the other mailbox tools can all be done in the background. Check the status bar at the bottom of the screen to see if another process is running.

In those that did, troubleshooting Outlook startup issues the MIP API Enterprise Application had been disabled for some vague reason. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Conflicting rules can prevent certain rules from working as intended. Review your rules to identify any conflicts and resolve them by disabling or adjusting overlapping rules.

This issue has been mitigated and we are continuing to monitor the issue to ensure stability. The root cause was the deployment of an incorrect campaign data file, which led to false positive campaign detection. We have since reverted to the right data file and the outbound email flow has returned to a normal state. We also released a new rule that corrected the wrong campaign verdict for all impacted customers during the incident.

The usual fixes like resetting credentials, reinstalling Office, and clearing cached profiles had no effect. Our goal is to give you the answers to fix the most common issues Outlook users face. Bookmark this page so that whenever you come across an error like your Outlook calendar not syncing, troubleshooting Outlook startup issues or a corrupted file, you'll have a place to start troubleshooting. In case your Outlook PST is corrupt or damaged, you can always look for third-party Outlook PST Repair Tool to fix the issue. Inbox Repair Tool or ScanPST.exe is a free utility provided by Microsoft.

Some customers may not be able to see their Profile, Account or Sign Out options when selecting their picture on the top toolbar. Let’s start with the solutions to fix these common Outlook errors. You have seen that we have discussed the various reasons why common Outlook errors happen. Furthermore, we will be going to describe to you the numerous Outlook Errors that are shown in MS Outlook and their fixes.

Avoid using unstable or low internet connection and use a reliable and high-speed internet connection with reasonable download/upload speed. You must have encountered Outlook Connection Error occasionally. The reason behind this error is an invalid entry of the target troubleshooting Outlook startup issues machine, problems with DNS resolution or an incorrect IP address. Resolve this error by verifying the server’s name or checking the DNS resolution. Some common Outlook errors are listed below with the solutions to fix them. Let’s find out the reasons that caused this error and acquire a knowledge of how you can tackle these errors.

Let us know how it will assist you in repairing your files. Most businesses and organizations rely on Outlook for daily communication and scheduling. This issue can disrupt your workflow and lead to data loss if not addressed promptly. Therefore, to help you out with this issue, here is a comprehensive guide with some effective troubleshooting solutions.

If you have a large number of items in any single folder, you may experience performance issues during certain operations. For more information, see Outlook performance issues when there are too many items or folders in a cached mode .ost or .pst file. An out-of-date antivirus program may sometimes cause errors when you try to start Outlook as there may be compatibility issues between your antivirus program and Outlook.

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Reference: bernadetterash/7963433#11