Scrolling with the mouse controls (wheel mouse or Apple Mighty Mouse) in the list view of the inbox (or any mail folder) is jumpy and not smooth. This makes it very difficult to control. This behavior changed with the 8.x client and was not present in the 7.x client. I consider it a regression.
Subject: Thanks for reporting the issue! It is a known issue – BMAS7CLJRD
Thanks for reporting the issue! It is a known issue – BMAS7CLJRD and it has been fixed in our internal daily build. Thank you!