Microsoft Acknowledges High CPU Usage Issue in Classic Outlook for Windows

Addressing High CPU Usage Issues in Classic Outlook for Windows

As part of its ongoing commitment, Microsoft plans to support Classic Outlook for Windows through 2029. However, many users have expressed concerns regarding the prioritization of this application, particularly related to a persistent bug affecting its performance.

Microsoft has confirmed that a notable high CPU usage issue has been plaguing Classic Outlook, causing the CPU to surge by 30% to 50% during email composition. Users can monitor this spike via the Task Manager, making it an observable problem.

According to a Microsoft support page highlighted by Beta News, this issue is present in Windows 11, particularly Version 2406 Build 17726.20126 and later. It affects users across various channels—including Current, Monthly, Enterprise, and those enrolled in the Windows Insider Program.

The release of Windows 11 version 2406 in June 2024 has seemingly exacerbated the situation. Although the Outlook Team is investigating this issue, no clear explanation for the CPU spikes has been provided. Users are understandably concerned, not only about the degrading performance, but also about the increased power consumption this entails.

Possible Workarounds

On a positive note, Microsoft has recommended users switch to the Semi Annual Channel as a workaround to alleviate the CPU spike issue. While the process may seem daunting, it involves making a minor edit in the Windows Registry. Follow these steps to implement the workaround:

Open Command Prompt: Launch Command Prompt by right-clicking it in the Start Menu and selecting Run as Administrator.
Enter the Registry Edit Command: Input the following command and press Enter:

reg add HKLM\Software\Policies\Microsoft\office\16.0\common\officeupdate /v updatebranch /t REG_SZ /d SemiAnnual

Initiate the Update: After successfully adding the registry key, navigate to File > Office Account > Update Options > Update Now to switch to the Semi Annual Channel.

It is essential to be aware that Microsoft is auto-installing the new version of Outlook on various Windows systems. This involuntary transition is not limited to Windows 11; Windows 10 users are also affected by these updates when security patches are applied.

Final Thoughts

The high CPU usage issue in Classic Outlook is a significant concern for many users. By taking the initiative to switch to the Semi Annual Channel, you may alleviate the performance hiccups impacting your workflow. Keeping your software updated and staying informed about Microsoft’s plans is critical to enhancing your productivity with Classic Outlook.

Frequently Asked Questions

1. What types of users are affected by the CPU usage issue in Classic Outlook?

Users on all channels—including Current, Monthly, Enterprise, and those in the Windows Insider Program—are experiencing the CPU spikes when typing in Classic Outlook.

2. How can I confirm if my CPU usage is spiking while using Classic Outlook?

You can verify CPU usage by opening the Task Manager. If you notice a significant increase (30% to 50%) while composing emails, it’s likely you are affected by the issue.

3. Is Microsoft planning to resolve the CPU issue in Classic Outlook soon?

While Microsoft has acknowledged the issue and stated that its Outlook Team is investigating, there is no specific timeline for resolution provided as of now.

Source & Images