There's a bug in classic Outlook that causes CPU spikes while typing. Here's a workaround you can use until it's fixed.

Rolling classic Outlook back to version 2405 seems to fix the issue, but it comes with a not-insignificant tradeoff. Updates ...

Microsoft has confirmed it is working on a fix for a persistent issue causing significant CPU usage spikes for users of the ...

Microsoft was flagging some legitimate Adobe emails as spam The company blamed it on an error with its machine learning model ...