Found out how to disable Auto Preview in IMAP

[Andrew]

I noticed that a lot of people have had the problem where
Auto Preview keeps coming up with new messages in their
IMAP folder. And the MVP's solution wasn't working.

On the "Folder List" highlight the "Inbox" for the IMAP
folder that is giving you the AutoPreview Problem.

Click View >> Current View >> Customize Current View >>
Other Settings >> under the 'auto preview' section change
the radio button to "no auto preview"

This should work!