Microsoft confirms a writing issue in Classic Outlook that causes CPU spikes.
Microsoft warns users that using Classic Outlook may cause spikes in CPU usage.
Microsoft has issued a warning through its support blog regarding a significant issue affecting the recent version of classic Outlook. When composing an email in Version 2406 (Build 17726.20126) on the Current, Monthly Enterprise, or Insider channels, users may experience a CPU usage spike that can reach up to 50%. This phenomenon can also increase power consumption.
In light of this situation, the company temporarily suggests switching to the Microsoft 365 Apps channel as a workaround. The Outlook team is investigating the issue and will provide updates when more information becomes available. It is also recommended to consider switching to the Semi-Annual Channel, where the problem has not been detected.
Despite attempts by some users to resolve the issue by disabling add-ins, graphics acceleration, and spell checking, the symptoms persist. Microsoft has provided guidance to facilitate switching to another channel, including a registry command that allows switching to the Semi-Annual Channel via the command prompt with administrator privileges.
This issue does not only affect mid-range computers; some users with Intel Core i9-14900HX processors report CPU temperatures reaching 95 degrees Celsius, even with just having a 'New Message' window open. These reports date back to November of last year, and the urgency to find a definitive solution is evident, as an overheated CPU can lead to crashes and freezes, jeopardizing important projects without backup.
Additionally, Microsoft is also facing another inconvenience with the Outlook application, where the program may crash when opening more than 60 emails at once. This problem adds to the difficulties related to using the Ctrl + C keyboard shortcut. The software giant is investigating these incidents and has issued error messages offering suggestions to address the situation, such as restarting Outlook or closing some windows or programs.
Meanwhile, the company has decided to cancel plans to change how photos are stored in OneDrive, taking into account the massive criticism from users. On the other hand, Outlook will soon receive an update that will make it easier for users to send large files without errors, as detailed in the Microsoft 365 roadmap.
