In a post on Microsoft’s Support blog, the company warns that typing in a recent version of classic Outlook can lead to high CPU usage. The issue could cause CPU usage to spike by up to 50%, and the company recommends switching to the Microsoft 365 Apps update channel as a temporary workaround.
The problems occur when composing an email in Version 2406 (Build 17726.20126) on the Current Channel, Monthly Enterprise Channel, or Insider Channels. Affected users report CPU usage increases between 20% and 50%, which can also raise power consumption. Microsoft says the Outlook team is investigating and will provide further updates as they become available.
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