I am using Outlook Classic in office 365 and it hangs and says not responding

Question

I am using Office 365 and the classic outlook continuously hangs and the error message I recieve is outlook not responding

Answer 1

Open the Settings App, go to Windows Updates - Update History, what is the KB number of the latest update installed, is it, KB5074109?

Answer 2

If Outlook Classic is hanging and displaying a "not responding" message, you can try the following troubleshooting steps:

1. Run Outlook in Safe Mode: Exit Outlook, then open a Run dialog box (press Windows logo key + R), type Outlook /safe, and click OK. If Outlook works fine in Safe Mode, the issue might be caused by an add-in.
2. Disable Add-ins: If the issue is resolved in Safe Mode, go to File > Options > Add-Ins, select COM Add-ins, click Go, and then clear all check boxes. Restart Outlook and enable add-ins one by one to identify the problematic one.
3. Repair Office: Open Control Panel, click on Uninstall a program, right-click your Office installation, select Change, and then choose Online Repair.
4. Run Outlook Diagnostics: Use the Classic Outlook Connectivity troubleshooter to fix issues. Make sure you are using the same Windows device that has classic Outlook installed.
5. Create a New Outlook Profile: If the problem persists, you might need to create a new Outlook profile. Go to Control Panel > Mail > Show Profiles, select the profile to remove, and then click Add to create a new one.
6. Run the Classic Outlook Advanced Diagnostics troubleshooter: This will generate a detailed configuration report to help identify the issue.

If these steps do not resolve the issue, consider reaching out to Microsoft Community for further assistance.

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References:

• How to troubleshoot issues that cause Outlook to crash or stop responding when used with Microsoft 365
• Outlook performance is slow in the Microsoft 365 environment