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Microsoft Investigates Classic Outlook Bug Causing CPU Spikes When Typing

The confirmed issue, affecting recent builds, leads to CPU usage surges of up to 50%, with a temporary workaround advised as a permanent fix remains under development.

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Overview

  • Microsoft has confirmed a bug in classic Outlook that causes CPU usage to spike by 30-50% when typing in emails.
  • The issue impacts users on the Current, Monthly Enterprise, and Insider Channels running Version 2406 Build 17726.20126 or later.
  • Affected users are advised to switch to the Semi-Annual Channel, which remains unaffected by the bug, as a temporary solution.
  • Reports indicate severe impacts, including CPU overheating, with some users noting temperatures exceeding 95°C while composing emails.
  • Microsoft's Outlook team is actively investigating the issue, but no timeline for a permanent fix has been announced.