Secelcted read messages need to be highlighted with color
It's impossible to determine which message you are looking at after a message has been read. There is no accent color or highlight color showing the selected message. Please see the attached image.
Selected message has blue highlight (background). It is that one showed below the message you think is selected.
Brandon woods commented
Pavel, I see that you are correct that the message is highlighted but when you click anywhere else on the screen in the actual email then you can no longer see which message you are in. The highlighting goes away! It looks to me like you are using the focus to highlight. Instead you should pick some other method because frankly this is the only thing that really bugs me about the kerio client. Other than that it's great.