Windows 10: Microsoft confirms Classic Outlook for Windows has a high CPU usage issue

Microsoft will support Classic Outlook for Windows until 2029, but that doesn't necessarily seem like the app gets priority. The classic version of the mail client has had a bug that users have been complaining about for nearly a year.

Microsoft has finally acknowledged the problem, outlining it as a high CPU usage issue. The bug in question causes the CPU to spike up by 30 or 50% when a user types an email in the Classic Outlook app. The company noted that users can observe this behavior if the Task Manager is open.

According to a support page spotted by Beta News, this bug exists in Windows 11 Version 2406 Build 17726.20126 and above. It affects users on all channels, including the Current, Monthly, Enterprise release channels, and even those in the Windows Insider Program. Microsoft released Windows 11 v2406 in June 2024.

While Microsoft stated that the Outlook Team is investigating this issue, it has not provided an explanation for the problem. Users are puzzled at what could be causing the performance issue? This is rather concerning given that CPU usage spikes also increase the power consumption of the computer.

But there is some good news, Microsoft has provided a workaround to solve this bizarre problem. It is advising users to switch to the Semi Annual Channel, to mitigate the issue. This is easier said than done, but there is a quick way to this, by editing the Windows Registry.

Here's what you need to do.

1. Open a Command prompt window (ensure Run as administrator was selected).
2. Paste the command below and press Enter:
   ???????reg add HKLM\Software\Policies\Microsoft\office\16.0\common\officeupdate /v updatebranch /t REG_SZ /d SemiAnnual
3. After you add the registry key, select File > Office Account > Update Options > Update Now to initiate the switch to Semi Annual Channel.

As a reminder, Microsoft is forcibly installing the new Outlook app automatically on Windows. This isn't restricted to Windows 11, the company is also installing the app on Windows 10 when Windows Update installs the latest security patches.

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Hi Sibtain,

Let's try to isolate the cause of this issue with the high CPU usage in Edge. We suggest that you clear your browsing data. Clearing your browsing data will help improve the performance of Edge. To clear, kindly follow the steps below:

• Open Edge.
• Click on the three dots icon on the upper-right part of the screen.
• Click Settings.
• Under Clear browsing data, click on Choose what to clear.
• Click on Clear.

You can also visit this link with a similar concern as yours and check the solution
provided by Josette Sal.

Let us know if you have any other questions.

 

Windows Explorer high CPU Usage in Windows 10

To further troubleshoot the issue, we suggest checking the Task Manager again to see what are the
applications that have high CPU usage. To do this, follow the same steps you did from the previous reply:

• Click on the Start button and type Task Manager on the search box.
• On the Task Manager window, you should see the programs running.
• Click on the More details drop-down button to see the total number of apps running and their real-time CPU usage.

However, based on your response above, it seems that you may need to create a new user account again and just install your apps manually instead of copying them as your
previous user account might be corrupted.

Once your done with the steps, please let us know how it goes.

 

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Hello,

See if other suggestions mentioned here helps you:

[FIX] Windows 10 High CPU Usage Problem

Let us know if this helps!

Note: Included link in this reply refers to blog post by a trusted Microsoft MVP.