Today is the first day for me that Outlook (Preview channel) tried the hard upsell, popping up a banner upon start to entice me (I don't mean the little toggle, which has been there for seemingly years). The help article revealed this, and it was on, so presumably turning it off will work for a while:
If you're not interested in trying the new Outlook for Windows just yet and don't want to be a part of this one-time switch, in classic Outlook go to File > Options> General > New Outlook options and uncheck Automatically switch me to new Outlook.
My Computer
System One
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- OS
- Windows 11