I'm currently using the utility Mail Unread Menu on my MacBook running High Sierra. This adds an item to the menu bar showing the number of unread messages in selected mailboxes/folders.
I'm getting ready to upgrade to Big Sur, and this utility won't run, because it's 32-bit. I tried contacting the author to find out if a 64-bit version is available, but he said it's no longer being maintained.
Does anyone know of something similar? Ideally I should be able to configure which folders it considers, as I have some folders that I put messages into using rules but don't need immediate notification of.
I know that an unread count is shown as a badge on the Dock icon, but I normally have my Dock hidden. Also, I'm more restrictive about the folders I want to be included in the menu count than the Dock count.