How to Fix Classic Outlook’s CPU Spike Issue on Windows
1 min read
Summary
The Classic Outlook is plagued by a bug which causes high CPU usage every time a user types an email, making the system run slowly and often causing the computer to overheat.
This issue affects both Windows 10 and 11 users across all channels, and Microsoft is yet to release a permanent fix.
In the meantime, a temporary solution is to revert to Outlook version 2405.
This removes the bug, but it also skips recent security updates, leaving the user vulnerable.
Microsoft is rolling out a permanent fix predicted for May 2025, which will be available to a select group of insiders first, before a final release to all.
Until then, users can use the New Outlook version or explore alternate email apps.
