Microsoft has assured that it will soon fix a known bug that causes spikes in CPU usage when typing in the classic Outlook email client.
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Last week, the company confirmed the existence of this error, which was preceded by a wave of complaints from users of the program since the beginning of November – complaints were published on various resources, including the community section on the Microsoft website itself: the problems with processor loading were not solved by completely disabling all add-ons and spell checking options.
Microsoft confirmed that the processor load level can reach 30-50%, energy consumption increases; it turned out that the problem affected users who installed the Outlook update version 2406, build 17726.20126 and later. One of the temporary options to solve the problem quickly is to roll back to version 2405, but this is not always a justified solution, because security updates were released for the program after the release of this version.
The issue with classic Outlook will be fixed in early May with the release of the following builds:
- Beta Channel (version 2505, build 18822.15000) – estimated at the beginning of May 2025;
- Current Channel Preview (version 2505, build 18827.20000) – estimated to be released mid-May 2025;
- Current Channel (version 2505, build 18827.20000) – tentatively at the end of May 2025.
To roll back to the latest version of classic Microsoft Outlook, you will need to find the appropriate version on your update channel and enter the appropriate command in the command line interface. Alternatively, a utility is available for rolling back to earlier versions of programs from the office suite.